1447
He entered politics in 1964 , when became administrative assistant to U.S. Representative Phillip Burton , a Democrat .
 person: Phillip Burton
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: Phillip Burton 
Answer:
 person: Phillip Burton