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Many of the Chairmen of the  Council of Economic Advisers  have also been NBER Research Associates including the former NBER President and Harvard Professor  Martin Feldstein  .
 employee of: Council of Economic Advisers, Martin Feldstein
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:
 employee of: Council of Economic Advisers, Martin Feldstein