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Cross-Harbour Bus Route 606 is a bus route in  Hong Kong  jointly operated by Kowloon Motor Bus ( KMB ) and  Citybus  .
 country of headquarters: Hong Kong, Citybus
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:  Hong Kong, Citybus 
Answer:
 country of headquarters: Hong Kong, Citybus