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After two strong minor league seasons in three years , Beard was promoted to the Athletics and made his major league debut at age 20 on July 16 , 1980 , pitching the ninth inning of a loss to the Tigers .
 Beard, Athletics, Tigers
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Beard, Athletics, Tigers