5209
Operated by the  San Francisco Municipal Railway  ( Muni ) a part of the  San Francisco Municipal Transportation Agency  ( SFMTA ) Muni Metro serves passengers a day making it the second busiest light rail system in the United States .
 subsidiaries: San Francisco Municipal Railway, San Francisco Municipal Transportation Agency
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:  San Francisco Municipal Railway, San Francisco Municipal Transportation Agency 
Answer:
 subsidiaries: San Francisco Municipal Railway, San Francisco Municipal Transportation Agency