6467
By 1975 when the Khmer Rouge took power , it was estimated at 7.3 million .
 organization: Khmer Rouge
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: Khmer Rouge 
Answer:
 organization: Khmer Rouge