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plastic knee joints from retired dolls are now used to make knuckles in prosthetic fingers for amputees at duke university medical center .
 organization: duke university; organization: duke university medical center; person: amputees
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: geographical social political, organization, person, location, facility, vehicle, weapon 
Text: {0} 
 Entities: duke university, duke university medical center, amputees 
Answer:
 organization: duke university; organization: duke university medical center; person: amputees