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: Rockwell-MBB X-31 | Statement: [X-Plane experimental aircraft programs, notableAircraft, Rockwell-MBB X-31]

Target entity: Rockwell-MBB X-31
Context triple: [X-Plane experimental aircraft programs, notableAircraft, Rockwell-MBB X-31]

• A. Grumman X-29
  The Grumman X-29 was an experimental U.S. research aircraft notable for its forward-swept wings, advanced composite materials, and fly-by-wire control system used to explore extreme aerodynamic concepts.
• B. Douglas X-3 Stiletto
  The Douglas X-3 Stiletto was a slender, jet-powered experimental research aircraft of the early 1950s designed to investigate sustained supersonic flight and advanced aerodynamic concepts for future high-speed aircraft.
• C. Northrop X-21
  The Northrop X-21 was an experimental U.S. jet aircraft of the 1960s designed to test laminar-flow control technology for improved aerodynamic efficiency.
• D. Bell X-5
  The Bell X-5 was an early U.S. experimental jet that pioneered variable-sweep wing technology, helping to shape the design of later high-performance military aircraft.
• E. Bell X-2
  The Bell X-2 was a rocket-powered experimental research aircraft developed in the 1950s to investigate flight characteristics at extremely high speeds and altitudes, contributing crucial data to early supersonic and space-era aeronautics.
• 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: Rockwell-MBB X-31
Triple: [X-Plane experimental aircraft programs, notableAircraft, Rockwell-MBB X-31]

The Rockwell-MBB X-31 was an experimental jet fighter demonstrator designed to test advanced thrust vectoring and high-angle-of-attack maneuverability technologies.

Target entity: Rockwell-MBB X-31
Target entity description: The Rockwell-MBB X-31 was an experimental jet fighter demonstrator designed to test advanced thrust vectoring and high-angle-of-attack maneuverability technologies.

• A. Grumman X-29
  The Grumman X-29 was an experimental U.S. research aircraft notable for its forward-swept wings, advanced composite materials, and fly-by-wire control system used to explore extreme aerodynamic concepts.
• B. Douglas X-3 Stiletto
  The Douglas X-3 Stiletto was a slender, jet-powered experimental research aircraft of the early 1950s designed to investigate sustained supersonic flight and advanced aerodynamic concepts for future high-speed aircraft.
• C. Northrop X-21
  The Northrop X-21 was an experimental U.S. jet aircraft of the 1960s designed to test laminar-flow control technology for improved aerodynamic efficiency.
• D. Bell X-5
  The Bell X-5 was an early U.S. experimental jet that pioneered variable-sweep wing technology, helping to shape the design of later high-performance military aircraft.
• E. Bell X-2
  The Bell X-2 was a rocket-powered experimental research aircraft developed in the 1950s to investigate flight characteristics at extremely high speeds and altitudes, contributing crucial data to early supersonic and space-era aeronautics.
• F. None of above. chosen