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Racing career 1900 : Two-Year-Old season Gold Heels was purchased by William C. Whitney but after racing him a short time at age two , the colt was deemed to have limited potential and in June 1900 was sold for $ 1,500 to trainer David Sloan , a cousin of future Hall of Fame jockey Tod Sloan .
 Racing, William C. Whitney, Sloan, Fame, Tod Sloan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Racing, William C. Whitney, Sloan, Fame, Tod Sloan