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The experiments of Ivan Pavlov required several pairings of the neutral stimulus ( e.g. , a ringing bell ) with the unconditioned stimulus ( i.e. , meat powder ) before the neutral stimulus elicited a response .
 person: Ivan Pavlov
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: Ivan Pavlov 
Answer:
 person: Ivan Pavlov