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Bulgaria  's centre-right opposition GERB party of Sofia Mayor Boyko Borisov beat Prime Minister  Sergey Stanishev  's ruling socialists in European Parliament elections official results showed Monday .
 Bulgaria, Sergey Stanishev
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:
 Bulgaria, Sergey Stanishev