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Other philosophers , such as Thomas Hobbes and David Gauthier , have argued that the conflicts which arise when people each pursue their own ends can be resolved for the best of each individual only if they all voluntarily forgo some of their aims - that is , one 's self-interest is often best pursued by allowing others to pursue their self-interest as well so that liberty is equal among individuals .
 person: Thomas Hobbes; person: David Gauthier
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: Thomas Hobbes, David Gauthier 
Answer:
 person: Thomas Hobbes; person: David Gauthier