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In April 1823 , U.S. Secretary of State John Quincy Adams discussed the rules of political gravitation , in a theory often referred to as the " ripe fruit theory " .
 U.S., John Quincy Adams
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 U.S., John Quincy Adams