78370
In 1974 , Tamiaki Yoneya discovered that all the known string theories included a massless spin-two particle that obeyed the correct Ward identities to be a graviton .
 person: Tamiaki Yoneya
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: Tamiaki Yoneya 
Answer:
 person: Tamiaki Yoneya