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: XB-17 | Statement: [Boeing Model 299, militaryDesignation, XB-17]

Target entity: XB-17
Context triple: [Boeing Model 299, militaryDesignation, XB-17]

• A. HC-27J Spartan
  The HC-27J Spartan is a medium-range, twin-engine turboprop aircraft used by the U.S. Coast Guard for missions such as search and rescue, maritime patrol, and transport.
• B. SA-17 Grizzly
  SA-17 Grizzly is the NATO reporting name for a Russian-made, medium-range, mobile surface-to-air missile system designed to engage aircraft, cruise missiles, and other aerial threats.
• C. X-20
  X-20 was an experimental U.S. Air Force spaceplane project from the early Cold War era intended to test reusable, piloted orbital and suborbital flight before being canceled in the 1960s.
• D. Rocketship X-M
  Rocketship X-M is a 1950 American science fiction film about a pioneering but perilous manned expedition to Mars.
• E. Skymaster
  Skymaster is the NATO reporting name for the Douglas C-54, a four-engine military transport aircraft widely used by the United States and its allies during and after World War II.
• 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: XB-17
Triple: [Boeing Model 299, militaryDesignation, XB-17]

XB-17 was the prototype version of Boeing’s B-17 Flying Fortress, a pioneering four-engine heavy bomber developed for the United States Army Air Corps in the 1930s.

Target entity: XB-17
Target entity description: XB-17 was the prototype version of Boeing’s B-17 Flying Fortress, a pioneering four-engine heavy bomber developed for the United States Army Air Corps in the 1930s.

• A. HC-27J Spartan
  The HC-27J Spartan is a medium-range, twin-engine turboprop aircraft used by the U.S. Coast Guard for missions such as search and rescue, maritime patrol, and transport.
• B. SA-17 Grizzly
  SA-17 Grizzly is the NATO reporting name for a Russian-made, medium-range, mobile surface-to-air missile system designed to engage aircraft, cruise missiles, and other aerial threats.
• C. X-20
  X-20 was an experimental U.S. Air Force spaceplane project from the early Cold War era intended to test reusable, piloted orbital and suborbital flight before being canceled in the 1960s.
• D. Rocketship X-M
  Rocketship X-M is a 1950 American science fiction film about a pioneering but perilous manned expedition to Mars.
• E. Skymaster
  Skymaster is the NATO reporting name for the Douglas C-54, a four-engine military transport aircraft widely used by the United States and its allies during and after World War II.
• F. None of above. chosen