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Oil Minister Rafael Ramirez said Petroleos de Venezuela SA or  PDVSA  could sell some assets of its Houston-based subsidiary  Citgo  Petroleum Corp .
 subsidiaries: PDVSA, Citgo
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:
 subsidiaries: PDVSA, Citgo