3560
He received his Ph.D. in international economics from  Harvard University  in 1988 where his adviser was  Jeffrey Sachs  .
 Harvard University, Jeffrey Sachs
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:
 Harvard University, Jeffrey Sachs