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Celebrities Alex Trebek , Merv Griffin , Johnny Gilbert , Jeane Dixon , Burt Reynolds , Marvin Mitchelson , Edwin Newman , Bob Hope , Sonny Bono , Lyle Waggoner , and Julio Iglesias all guest starred as themselves on various episodes .
 Alex Trebek, Merv Griffin, Johnny Gilbert, Jeane Dixon, Burt Reynolds, Marvin Mitchelson, Edwin Newman, Bob Hope, Sonny Bono, Lyle Waggoner, Julio Iglesias
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Alex Trebek, Merv Griffin, Johnny Gilbert, Jeane Dixon, Burt Reynolds, Marvin Mitchelson, Edwin Newman, Bob Hope, Sonny Bono, Lyle Waggoner, Julio Iglesias