15300
He served with the Grenadier Guards from 1944 to 1947 .
 organization: Grenadier Guards
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: Grenadier Guards 
Answer:
 organization: Grenadier Guards