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Because a low-frequency beam at a high intensity could not build up the energy required to produce photoelectrons like it would have if light 's energy was coming from a continuous wave , Einstein proposed that a beam of light is not a wave propagating through space , but a collection of discrete wave packets - photons .
 person: Einstein
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: Einstein 
Answer:
 person: Einstein