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Dave Scott ( born January 4 , 1954 ) is a U.S. triathlete and the first six-time Ironman Triathon World Champion .
 Dave Scott, U.S.
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Dave Scott, U.S.