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Sarah Milledge  Nelson  ( born 1931 ) is an American archaeologist and a  professor  in the Department of Anthropology University of Denver United States .
 title of person: Nelson, professor
Given options, please tell me the relationships of all the listed entity pairs.Output format is "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} 
 Entity Pairs:  Nelson, professor 
Answer:
 title of person: Nelson, professor