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During his residency at Massachusetts Mental Health Center , he studied with J. Allan Hobson .
 person: J. Allan Hobson
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: J. Allan Hobson 
Answer:
 person: J. Allan Hobson