Triple

Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).

Phrase: M-21 | Statement: [Lockheed A-12 program, aircraftVariantDeveloped, M-21]

Target entity: M-21
Context triple: [Lockheed A-12 program, aircraftVariantDeveloped, M-21]

• A. M-22
  M-22 is a scenic state highway in Michigan renowned for its picturesque route along the Lake Michigan shoreline and through the Leelanau Peninsula near Traverse City.
• B. M-20
  M-20 is a state trunkline highway in Michigan that runs east–west across the central part of the state, connecting communities such as Midland to the broader regional road network.
• C. M-28
  M-28 is a major east–west state highway running across Michigan’s Upper Peninsula, connecting numerous communities along the southern shore of Lake Superior.
• D. M-115
  M-115 is a state trunkline highway in Michigan that serves as a regional connector route through the central and northwestern parts of the Lower Peninsula.
• E. M-24
  M-24 is a state highway in Michigan that serves as a key north–south transportation route through communities such as Orion Township.
• F. None of above. chosen
• G. Unsure - the case is ambiguous/there is not enough information to decide.

Generate a one-sentence description of the target entity. 
You are given a context triple in the form (subject, predicate, object), where the object is the target entity. 
# Instructions
Use the triple to infer relevant information about the entity. Describe the entity based on what is most defining, well-known. 
Avoid repeating the information from the triple, unless really essential.
# Response Format
Return only the sentence: "Description: [one-sentence description of the target entity]"

Entity: M-21
Triple: [Lockheed A-12 program, aircraftVariantDeveloped, M-21]

The M-21 was a specialized variant of the Lockheed A-12 reconnaissance aircraft, modified to carry and launch the D-21 unmanned reconnaissance drone from its back at high altitude and speed.

Target entity: M-21
Target entity description: The M-21 was a specialized variant of the Lockheed A-12 reconnaissance aircraft, modified to carry and launch the D-21 unmanned reconnaissance drone from its back at high altitude and speed.

• A. M-22
  M-22 is a scenic state highway in Michigan renowned for its picturesque route along the Lake Michigan shoreline and through the Leelanau Peninsula near Traverse City.
• B. M-20
  M-20 is a state trunkline highway in Michigan that runs east–west across the central part of the state, connecting communities such as Midland to the broader regional road network.
• C. M-28
  M-28 is a major east–west state highway running across Michigan’s Upper Peninsula, connecting numerous communities along the southern shore of Lake Superior.
• D. M-115
  M-115 is a state trunkline highway in Michigan that serves as a regional connector route through the central and northwestern parts of the Lower Peninsula.
• E. M-24
  M-24 is a state highway in Michigan that serves as a key north–south transportation route through communities such as Orion Township.
• F. None of above. chosen

Target predicate: aircraftVariantDeveloped
Context triple: [Lockheed A-12 program, aircraftVariantDeveloped, M-21]

• A. developedAircraft chosen
  Indicates that an entity (such as a person or organization) was responsible for designing, creating, or engineering a particular aircraft.
• B. specificCarrierAircraftVariant
  Indicates that one aircraft variant is a specific version designed or adapted for carrier-based operations of another, more general aircraft variant.
• C. aircraftConfigurationProduced
  Indicates that a specific aircraft configuration has been manufactured or produced.
• D. fuselageVariant
  Indicates that one fuselage is a specific version or variant derived from another fuselage design.
• E. isMilitaryVariantOf
  Indicates that one entity is a military-specific version or adaptation of another, typically civilian or general-purpose, entity.
• F. None of above.