89576
He was re-elected in 1950 and 1951 , and held the seat until his defeat at the 1955 general election by the Conservative William Yates .
 person: William Yates
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: William Yates 
Answer:
 person: William Yates