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Horace Albert " Nook " Barker ( November 29 , 1907 – December 24 , 2000 ) was an American biochemist and microbiologist who studied the operation of biological and chemical processes in plants , humans and other animals , including using radioactive tracer s to determine the role enzyme s play in synthesizing sucrose .
 person: Horace Albert; person: Barker; location: American
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: Horace Albert, Barker, American 
Answer:
 person: Horace Albert; person: Barker; location: American