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He was appointed chairman of the National Endowment for the Arts , by President Bill Clinton and served from 1998 to 2001 .
 National Endowment for the Arts, Bill Clinton
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 National Endowment for the Arts, Bill Clinton