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The red-chip companies will include China National Offshore Oil Corporation and  CNPC  (  Hong Kong  ) Limited which trade in crude oil and oil exploration stocks said TWSE Chairman Chi Schive .
 city of headquarters: CNPC, Hong Kong
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: CNPC, Hong Kong