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Philosopher Nick Bostrom has noted a possible trade-off , namely that some existential risks might be mitigated by a powerful permanent world government , but that such power could in turn enhance any existential risks associated with permanent dictatorship .
 person: Nick Bostrom
Please list all entity words in the text that fit the category.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} 
Answer:
 person: Nick Bostrom