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Based on his theory that dementia praecox is the product of autointoxication emanating from the sex glands , Kraepelin experimented , without success , with injections of thyroid , gonad and other glandular extracts .
 person: Kraepelin
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: Kraepelin 
Answer:
 person: Kraepelin