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One of his instructors was Martin Scorsese , while Oliver Stone and Christopher Guest were among his classmates .
 person: Martin Scorsese; person: Oliver Stone; person: Christopher Guest
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: Martin Scorsese, Oliver Stone, Christopher Guest 
Answer:
 person: Martin Scorsese; person: Oliver Stone; person: Christopher Guest