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In 1913 Elmer McCollum discovered the first vitamins , fat-soluble vitamin A and water-soluble vitamin B ( in 1915 ; later identified as a complex of several water-soluble vitamins ) and named vitamin C as the then-unknown substance preventing scurvy .
 person: Elmer McCollum; person: B
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: Elmer McCollum, B 
Answer:
 person: Elmer McCollum; person: B