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Troy  Mich.-based  Delphi  blames its difficulties on circumstances beyond its control such as the credit crunch and collapsing light-truck sales at General Motors .
 city of headquarters: Troy, Delphi
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: Troy, Delphi