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Melchior Rudolf Bürgin ( born 17 October 1943 ) is a former Swiss rower who competed at the 1964 Summer Olympics , the 1968 Summer Olympics and the 1972 Summer Olympics .
 person: Melchior; person: Bürgin
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: Melchior, Bürgin 
Answer:
 person: Melchior; person: Bürgin