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The idea of substance was famously critiqued by David Hume , who held that since substance cannot be perceived , it should not be assumed to exist .
 person: David Hume
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: David Hume 
Answer:
 person: David Hume