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That diseases could result from some dietary deficiencies was further investigated by Christiaan Eijkman , who in 1897 discovered that feeding unpolished rice instead of the polished variety to chickens helped to prevent a kind of polyneuritis that was the equivalent of beriberi .
 person: Christiaan Eijkman; plant: rice
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Christiaan Eijkman, rice 
Answer:
 person: Christiaan Eijkman; plant: rice