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Petron said is a statement to the Philippine Stock Exchange the Ashmore unit has offered US$ 550 million ( euro353 million ) for the 3.75 billion Petron shares held by Aramco Overseas a subsidiary of  Saudi Aramco  the national oil company of the  Kingdom of Saudi Arabia  .
 country of headquarters: Saudi Aramco, Kingdom of Saudi Arabia
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:
 country of headquarters: Saudi Aramco, Kingdom of Saudi Arabia