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In May 1943 , he also became head of the Office of War Mobilization .
 organization: Office of War Mobilization
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: Office of War Mobilization 
Answer:
 organization: Office of War Mobilization