10655
He became Chief of the Air Staff on 1 January 1953 .
 person: Chief of the Air Staff
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: Chief of the Air Staff 
Answer:
 person: Chief of the Air Staff