684
MARC  is administered by the  Maryland Transit Administration  ( MTA ) a Maryland Department of Transportation ( MDOT ) agency and is operated under contract by CSX Transportation and Amtrak .
 subsidiaries: MARC, Maryland Transit Administration
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:  MARC, Maryland Transit Administration 
Answer:
 subsidiaries: MARC, Maryland Transit Administration