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: Eidan Subway | Statement: [Teito Rapid Transit Authority, alsoKnownAs, Eidan Subway]

Target entity: Eidan Subway
Context triple: [Teito Rapid Transit Authority, alsoKnownAs, Eidan Subway]

• A. Sendai Subway
  Sendai Subway is an urban rapid transit system serving the city of Sendai in Japan, providing key north–south and east–west rail connections across the metropolitan area.
• B. Hell's Gate Airtram
  Hell's Gate Airtram is a scenic aerial tramway in British Columbia that carries visitors over the turbulent Fraser River through the dramatic Fraser Canyon.
• C. Sheppard subway
  Sheppard subway is a Toronto Transit Commission rapid transit line in North York that runs east–west along Sheppard Avenue.
• D. Central Subway
  Central Subway is a light rail extension of San Francisco’s Muni Metro system that provides improved north–south transit service, including a key connection to the Chinatown neighborhood.
• E. Länsimetro
  Länsimetro is a major westward extension of the Helsinki Metro that connects central Helsinki with the neighboring city of Espoo through a series of new underground stations.
• 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: Eidan Subway
Triple: [Teito Rapid Transit Authority, alsoKnownAs, Eidan Subway]

Eidan Subway was the former name of Tokyo’s main rapid transit system, operated by the Teito Rapid Transit Authority before it became Tokyo Metro.

Target entity: Eidan Subway
Target entity description: Eidan Subway was the former name of Tokyo’s main rapid transit system, operated by the Teito Rapid Transit Authority before it became Tokyo Metro.

• A. Sendai Subway
  Sendai Subway is an urban rapid transit system serving the city of Sendai in Japan, providing key north–south and east–west rail connections across the metropolitan area.
• B. Hell's Gate Airtram
  Hell's Gate Airtram is a scenic aerial tramway in British Columbia that carries visitors over the turbulent Fraser River through the dramatic Fraser Canyon.
• C. Sheppard subway
  Sheppard subway is a Toronto Transit Commission rapid transit line in North York that runs east–west along Sheppard Avenue.
• D. Central Subway
  Central Subway is a light rail extension of San Francisco’s Muni Metro system that provides improved north–south transit service, including a key connection to the Chinatown neighborhood.
• E. Länsimetro
  Länsimetro is a major westward extension of the Helsinki Metro that connects central Helsinki with the neighboring city of Espoo through a series of new underground stations.
• F. None of above. chosen