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The Gulf state of Qatar will buy a 17 percent stake in  Volkswagen  a key shareholder and its chief executive  Martin Winterkorn  said on Thursday .
 Volkswagen, Martin Winterkorn
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; 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:
 Volkswagen, Martin Winterkorn