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The Study of the Negro Problems , from The Annals of the American Academy of Political and Social Science ( January 1898 ) , is an essay written by professor , sociologist , historian and activist W. E. B. Du Bois .
 organization: American Academy of Political and Social Science; person: W. E. B. Du Bois
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: American Academy of Political and Social Science; person: W. E. B. Du Bois