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BP  PLC Chief Executive John Browne is to retire at the end of July and will be succeeded by  Tony Hayward  the head of exploration and production the company said Friday .
 top members employees: BP, Tony Hayward
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:
 top members employees: BP, Tony Hayward