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In 1902 he started work at the London office of the Manchester Guardian , becoming London editor in 1912 .
 organization: Manchester Guardian
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: Manchester Guardian 
Answer:
 organization: Manchester Guardian