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Nicholas A. Christakis ( born May 7 , 1962 ) is an American physician and social scientist known for his research on social networks and on the socioeconomic and biosocial determinants of behavior , health , and longevity .
 person: Nicholas; person: Christakis
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Nicholas, Christakis 
Answer:
 person: Nicholas; person: Christakis