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As Ernest Gellner writes , " the idea that political boundaries must be congruent with ethnic ones , that rulers must not be ethnically distinguishable from the ruled now has a salience and authority which it has never possessed in the previous history of mankind " .
 person: Ernest Gellner
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: Ernest Gellner 
Answer:
 person: Ernest Gellner