4651
It was formerly run by Kowloon-Canton Railway Corporation ( KCR ) but has been leased for 50 years to the  MTR Corporation  which is partially owned by the  Hong Kong  Government .
 subsidiaries: MTR Corporation, Hong Kong
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:  MTR Corporation, Hong Kong 
Answer:
 subsidiaries: MTR Corporation, Hong Kong