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Michio Kaku and Keiji Kikkawa gave a different formulation of the bosonic string , as a string field theory , with infinitely many particle types and with fields taking values not on points , but on loops and curves .
 person: Michio Kaku; person: Keiji Kikkawa
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: Michio Kaku, Keiji Kikkawa 
Answer:
 person: Michio Kaku; person: Keiji Kikkawa