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Alexander Valeryevich Dyukov ( ) is Chairman of the management Board of  Gazprom  Neft one of  Russia  top-5 vertically integrated oil companies by production and amongst the largest oil companies in the world by proven reserves .
 country of headquarters: Gazprom, Russia
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:  Gazprom, Russia 
Answer:
 country of headquarters: Gazprom, Russia