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An option on his contract was not picked up in April 1989 and he retired , paving the way for Troy Aikman to take the reins of the struggling franchise .
 person: Troy Aikman
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: Troy Aikman 
Answer:
 person: Troy Aikman