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For example , while the best-known proposed forms ( with taxation and distribution ) are usually thought of as left-leaning ideas that right-leaning people try to defend against , other forms have been proposed even by libertarians , such as von Hayek and Friedman .
 person: von Hayek; person: Friedman
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: von Hayek, Friedman 
Answer:
 person: von Hayek; person: Friedman