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She served as president of the Organization of American Historians from 1980 to 1981 .
 organization: Organization of American Historians
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: Organization of American Historians 
Answer:
 organization: Organization of American Historians