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Keith Bontrager ( born December 18 , 1954 ) is a motorcycle racer who became a pioneer in the development of the modern mountain bike .
 person: Keith Bontrager
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Keith Bontrager