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Mark Twain wrote about ants in his 1880 book " A Tramp Abroad " .
 person: Mark Twain
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: Mark Twain 
Answer:
 person: Mark Twain