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: R21 series | Statement: [IND/BMT large-profile cars, hasCarTypeFamily, R21 series]

Target entity: R21 series
Context triple: [IND/BMT large-profile cars, hasCarTypeFamily, R21 series]

• A. I-70 Series
  The I-70 Series is the nickname for the 1985 World Series matchup between the Kansas City Royals and the St. Louis Cardinals, named for the Interstate highway connecting the two Missouri cities.
• B. R2000
  The R2000 is a 32-bit MIPS RISC microprocessor that became one of the earliest and most influential commercial implementations of the MIPS architecture in the mid-1980s.
• C. R2
  R2 is the MBTA station code used to identify Ashmont station on Boston's Red Line transit system.
• D. TS 21-series
  TS 21-series is a set of 3GPP technical specifications that define overall system architecture, principles, and frameworks for mobile telecommunications standards.
• E. 223 series
  The 223 series is a type of Japanese electric multiple unit commuter and suburban train operated primarily by JR West in the Kansai region.
• 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: R21 series
Triple: [IND/BMT large-profile cars, hasCarTypeFamily, R21 series]

The R21 series is a class of New York City Subway rolling stock built for the IND/BMT divisions, featuring large-profile steel cars used in mid-20th-century service.

Target entity: R21 series
Target entity description: The R21 series is a class of New York City Subway rolling stock built for the IND/BMT divisions, featuring large-profile steel cars used in mid-20th-century service.

• A. I-70 Series
  The I-70 Series is the nickname for the 1985 World Series matchup between the Kansas City Royals and the St. Louis Cardinals, named for the Interstate highway connecting the two Missouri cities.
• B. R2000
  The R2000 is a 32-bit MIPS RISC microprocessor that became one of the earliest and most influential commercial implementations of the MIPS architecture in the mid-1980s.
• C. R2
  R2 is the MBTA station code used to identify Ashmont station on Boston's Red Line transit system.
• D. TS 21-series
  TS 21-series is a set of 3GPP technical specifications that define overall system architecture, principles, and frameworks for mobile telecommunications standards.
• E. 223 series
  The 223 series is a type of Japanese electric multiple unit commuter and suburban train operated primarily by JR West in the Kansai region.
• F. None of above. chosen