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-70A-2 | Statement: [North American XB-70 Valkyrie, prototypeDesignation, XB-70A-2]

Target entity: XB-70A-2
Context triple: [North American XB-70 Valkyrie, prototypeDesignation, XB-70A-2]

• A. North American XB-70 Valkyrie
  The North American XB-70 Valkyrie was an experimental 1960s U.S. Air Force supersonic strategic bomber prototype designed to fly at Mach 3+ and high altitudes, notable for its advanced aerodynamics and distinctive canard-delta configuration.
• B. Convair B-58 Hustler
  The Convair B-58 Hustler was a Cold War-era United States Air Force supersonic jet bomber, notable as the first operational bomber capable of sustained Mach 2 flight.
• C. Bell X-1B
  The Bell X-1B was an advanced variant of the original Bell X-1 rocket-powered research aircraft, used primarily to investigate high-speed aerodynamic heating and stability at transonic and supersonic speeds.
• D. Bell X-1-2
  The Bell X-1-2 was one of the early U.S. rocket-powered experimental research aircraft used to explore high-speed, transonic, and supersonic flight in the late 1940s and early 1950s.
• E. Convair XF-92
  The Convair XF-92 was an experimental American delta-wing jet interceptor prototype developed in the late 1940s that served as a pioneering testbed for high-speed delta-wing aircraft design.
• 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-70A-2
Triple: [North American XB-70 Valkyrie, prototypeDesignation, XB-70A-2]

XB-70A-2 was the second prototype of the North American XB-70 Valkyrie, an experimental high-speed, high-altitude strategic bomber developed for the United States Air Force in the 1960s.

Target entity: XB-70A-2
Target entity description: XB-70A-2 was the second prototype of the North American XB-70 Valkyrie, an experimental high-speed, high-altitude strategic bomber developed for the United States Air Force in the 1960s.

• A. North American XB-70 Valkyrie chosen
  The North American XB-70 Valkyrie was an experimental 1960s U.S. Air Force supersonic strategic bomber prototype designed to fly at Mach 3+ and high altitudes, notable for its advanced aerodynamics and distinctive canard-delta configuration.
• B. Convair B-58 Hustler
  The Convair B-58 Hustler was a Cold War-era United States Air Force supersonic jet bomber, notable as the first operational bomber capable of sustained Mach 2 flight.
• C. Bell X-1B
  The Bell X-1B was an advanced variant of the original Bell X-1 rocket-powered research aircraft, used primarily to investigate high-speed aerodynamic heating and stability at transonic and supersonic speeds.
• D. Bell X-1-2
  The Bell X-1-2 was one of the early U.S. rocket-powered experimental research aircraft used to explore high-speed, transonic, and supersonic flight in the late 1940s and early 1950s.
• E. Convair XF-92
  The Convair XF-92 was an experimental American delta-wing jet interceptor prototype developed in the late 1940s that served as a pioneering testbed for high-speed delta-wing aircraft design.
• F. None of above.