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The proof of the Abel–Ruffini theorem uses this simple fact , and Felix Klein wrote a book that made use of the theory of icosahedral symmetries to derive an analytical solution to the general quintic equation , .
 person: Abel–Ruffini; person: Felix Klein
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Abel–Ruffini, Felix Klein 
Answer:
 person: Abel–Ruffini; person: Felix Klein