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Philosopher Brian Leftow has argued that the question cannot have a causal explanation ( as any cause must itself have a cause ) or a contingent explanation ( as the factors giving the contingency must pre-exist ) , and that if there is an answer it must be something that exists necessarily ( i.e. , something that just exists , rather than is caused ) .
 person: Brian Leftow
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: Brian Leftow 
Answer:
 person: Brian Leftow