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" champions against each other , with two winners moving on to face Ken Jennings in a three-game final for $ 2,000,000 , the largest prize in the show 's history ; overall , the tournament spanned 15 weeks and 76 episodes , starting on February 9 and ending on May 25 .
 Ken Jennings
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Ken Jennings