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Tesco  shares fell 2.6 percent after the supermarket giant announced its chief executive  Sir Terry Leahy  would retire in March next year .
 Tesco, Sir Terry Leahy
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:
 Tesco, Sir Terry Leahy