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Other Venezuelan passengers included Ruth Berhrrenes de Venezuela S.A. ( PDVSA ) representative in Uruguay ; Nelly Cardozo legal assessor of that company ; Wilfredo a protocol official ; and Daniel Uzcategui Specht son of PDVSA's vice-president Diego Uzcategui and Maria Isabel Specht Technology and Engineering Manager of  Citgo  Petroleum Corporation in  Houston  Texas .
 city of headquarters: Citgo, Houston
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: Citgo, Houston