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In the context of cognitive science of religion , dual inheritance theory can be understood as attempting to combine the cognitive byproduct and prosocial adaptation accounts using the theoretical approach developed by Robert Boyd and Peter Richerson , among others .
 person: Robert Boyd; person: Peter Richerson
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 Boyd, Peter Richerson 
Answer:
 person: Robert Boyd; person: Peter Richerson