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Appointed by President James Buchanan , he served as postmaster from September 1857 to March 1861 .
 person: James Buchanan
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: James Buchanan 
Answer:
 person: James Buchanan