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: AC-10 | Statement: [Southern Pacific Cab Forward locomotive, classificationBySP, AC-10]

Target entity: AC-10
Context triple: [Southern Pacific Cab Forward locomotive, classificationBySP, AC-10]

• A. AC-8
  AC-8 was a class of Southern Pacific Railroad articulated steam locomotives in the distinctive cab-forward configuration, used primarily for heavy freight service over mountainous routes in the early 20th century.
• B. AC-5
  AC-5 was a class of Southern Pacific Railroad cab-forward articulated steam locomotives built in the late 1920s for heavy freight service over mountainous routes.
• C. Beechcraft T-6 Texan II
  The Beechcraft T-6 Texan II is a single-engine turboprop military trainer aircraft widely used by air forces for primary and basic flight training.
• D. Alpha Jet
  The Alpha Jet is a light attack and advanced jet trainer aircraft developed jointly by France and Germany in the 1970s and widely used for pilot training and tactical support roles.
• E. Cessna O-2 Skymaster
  The Cessna O-2 Skymaster is a military twin-boom, push-pull configuration aircraft used primarily by the U.S. Air Force for forward air control and reconnaissance during the Vietnam War.
• 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: AC-10
Triple: [Southern Pacific Cab Forward locomotive, classificationBySP, AC-10]

AC-10 was a class of Southern Pacific Railroad cab-forward articulated steam locomotives built for heavy freight service over mountainous routes.

Target entity: AC-10
Target entity description: AC-10 was a class of Southern Pacific Railroad cab-forward articulated steam locomotives built for heavy freight service over mountainous routes.

• A. AC-8
  AC-8 was a class of Southern Pacific Railroad articulated steam locomotives in the distinctive cab-forward configuration, used primarily for heavy freight service over mountainous routes in the early 20th century.
• B. AC-5
  AC-5 was a class of Southern Pacific Railroad cab-forward articulated steam locomotives built in the late 1920s for heavy freight service over mountainous routes.
• C. Beechcraft T-6 Texan II
  The Beechcraft T-6 Texan II is a single-engine turboprop military trainer aircraft widely used by air forces for primary and basic flight training.
• D. Alpha Jet
  The Alpha Jet is a light attack and advanced jet trainer aircraft developed jointly by France and Germany in the 1970s and widely used for pilot training and tactical support roles.
• E. Cessna O-2 Skymaster
  The Cessna O-2 Skymaster is a military twin-boom, push-pull configuration aircraft used primarily by the U.S. Air Force for forward air control and reconnaissance during the Vietnam War.
• F. None of above. chosen