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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 options, please tell me the relationships of all the listed entity pairs.Output format is "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} 
 Entity Pairs:  PDVSA, Citgo 
Answer:
 subsidiaries: PDVSA, Citgo