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Career Fredrickson was best known for his work in the fields of comparative history , along with his work in the study of the history of racism and white supremacy .
 person: Fredrickson
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 
Answer:
 person: Fredrickson