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: Dorchester Extension of the Cambridge–Dorchester subway | Statement: [Broadway–South Boston station, partOf, Dorchester Extension of the Cambridge–Dorchester subway]

Target entity: Dorchester Extension of the Cambridge–Dorchester subway
Context triple: [Broadway–South Boston station, partOf, Dorchester Extension of the Cambridge–Dorchester subway]

• A. Jubilee line extension
  The Jubilee line extension is a major late-20th-century expansion of the London Underground that introduced new stations and modern infrastructure to connect central London with the Docklands and east London.
• B. Cambridge line
  The Cambridge line is a key railway route in eastern England that connects London with the city of Cambridge and its surrounding area.
• C. Northern line extension to Battersea
  The Northern line extension to Battersea is a London Underground project that extended the Northern line into the Battersea area to support major regeneration and improved transport links in south-west London.
• D. Green Line southern extension
  The Green Line southern extension is a Washington Metro expansion project that extended the Green Line further into the suburbs of Prince George's County, Maryland, adding several new stations beyond its previous terminus.
• E. The Silver Line
  The Silver Line is a UK-based helpline charity that offers information, friendship, and emotional support to older people to combat loneliness and isolation.
• 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: Dorchester Extension of the Cambridge–Dorchester subway
Triple: [Broadway–South Boston station, partOf, Dorchester Extension of the Cambridge–Dorchester subway]

The Dorchester Extension of the Cambridge–Dorchester subway was an early 20th-century expansion of Boston’s rapid transit system that extended service south from downtown Boston into the Dorchester area.

Target entity: Dorchester Extension of the Cambridge–Dorchester subway
Target entity description: The Dorchester Extension of the Cambridge–Dorchester subway was an early 20th-century expansion of Boston’s rapid transit system that extended service south from downtown Boston into the Dorchester area.

• A. Jubilee line extension
  The Jubilee line extension is a major late-20th-century expansion of the London Underground that introduced new stations and modern infrastructure to connect central London with the Docklands and east London.
• B. Cambridge line
  The Cambridge line is a key railway route in eastern England that connects London with the city of Cambridge and its surrounding area.
• C. Northern line extension to Battersea
  The Northern line extension to Battersea is a London Underground project that extended the Northern line into the Battersea area to support major regeneration and improved transport links in south-west London.
• D. Green Line southern extension
  The Green Line southern extension is a Washington Metro expansion project that extended the Green Line further into the suburbs of Prince George's County, Maryland, adding several new stations beyond its previous terminus.
• E. The Silver Line
  The Silver Line is a UK-based helpline charity that offers information, friendship, and emotional support to older people to combat loneliness and isolation.
• F. None of above. chosen