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After the discovery of the neutron in 1932 , models for a nucleus composed of protons and neutrons were quickly developed by Dmitri Ivanenko and Werner Heisenberg .
 person: Dmitri Ivanenko; person: Werner Heisenberg
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: Dmitri Ivanenko, Werner Heisenberg 
Answer:
 person: Dmitri Ivanenko; person: Werner Heisenberg