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David Hilbert concluded that the existence of such logical paradoxes tells us " that we must develop a meta-mathematical analysis of the notions of proof and of the axiomatic method ; their importance is methodological as well as epistemological " .
 person: David Hilbert
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: David Hilbert 
Answer:
 person: David Hilbert