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Cardinals ' owner Chris O'Brien was also fined $ 1,000 by Carr for allowing his team play a game against high schoolers , even though O'Brien claimed that he was unaware of the players ' status .
 Chris O'Brien, Carr, O'Brien
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Chris O'Brien, Carr, O'Brien