10762
File :  Kolkata  Metro.jpg |  Kolkata Metro  train File : Chennai local 14003 .
 city of headquarters: Kolkata, Kolkata Metro
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
 Entity Pairs:  Kolkata, Kolkata Metro 
Answer:
 city of headquarters: Kolkata, Kolkata Metro