191997
Fredrickson was also the president of the Organization of American Historians .
 person: Fredrickson; 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: Fredrickson, Organization of American Historians 
Answer:
 person: Fredrickson; organization: Organization of American Historians