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Arnold Seymour Relman M.D. ( b. 1923 New York City New York ) is a professor of medicine social medicine and emeritus at  Harvard Medical School   Boston  Massachusetts .
 city of headquarters: Harvard Medical School, Boston
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:
 city of headquarters: Harvard Medical School, Boston