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He was then appointed to John Buchan 's four person Advisory Committee on the Department of Information , and in December he prepared a further report , calling for greater centralisation of the propaganda effort and a larger role for the Advisory Committee .
 person: John Buchan
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: John Buchan 
Answer:
 person: John Buchan