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Colbert served as Chief of Staff to the Mayor of the City of  Ottawa   Larry O'Brien  ( Canadian politician ) from 2006-2010 Prior to that he served as a senior advisor to the Ministers of Health Environment and Community Family and Children's Services at Queen's Park .
 cities of residence: Ottawa, Larry O'Brien
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "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} 
Answer:
 cities of residence: Ottawa, Larry O'Brien