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Benjamin Julian Kaston ( July 2 , 1906 – August 24 , 1985 ) was an American arachnologist .
 person: Benjamin; person: Kaston
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: Benjamin, Kaston 
Answer:
 person: Benjamin; person: Kaston