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If black holes evaporate via Hawking radiation , a solar mass black hole will evaporate ( beginning once the temperature of the cosmic microwave background drops below that of the black hole ) over a period of 10 years .
 person: Hawking
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Hawking 
Answer:
 person: Hawking