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Barrick Gold  Corporation is the largest gold mining company in the world with its headquarters in  Toronto  Ontario Canada ; and four regional business units ( RBU's ) located in Australia Africa North America and South America .
 city of headquarters: Barrick Gold, Toronto
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:
 city of headquarters: Barrick Gold, Toronto