17550
The site is on the north side of Huntington Avenue , and since 1941 has been served by Prudential Station ( nee Mechanics Hall Station ) of the MBTA Green Line " E " Branch .
 organization: MBTA
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: MBTA 
Answer:
 organization: MBTA