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Starting in 1979 , Robert Freitas advanced arguments for the proposition that physical space-probes are a superior mode of interstellar communication to radio signals .
 person: Robert Freitas
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: Robert Freitas 
Answer:
 person: Robert Freitas