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Blue Light ( foaled 1958 in Ontario ) was a Canadian Thoroughbred racehorse who showed little promise as a two-year-old in 1960 but who won the 1961 Queen 's Plate , Canada 's most prestigious race and North America 's oldest annually run stakes race .
 Ontario, Canadian, North America '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:
 Ontario, Canadian, North America 's