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Two hours into a flight from  Ho Chi Minh  City to Sydney on Saturday the pilot was forced to return to  Vietnam  so the passenger could receive emergency medical treatment said Nguyen Van Quat the administrative head of the Southern Airport Authorities .
 countries of residence: Ho Chi Minh, Vietnam
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:
 countries of residence: Ho Chi Minh, Vietnam