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Parker received a B.A. degree from Yale University in 1831 , and his M.D. degree from the Yale Medical School , then called Medical Institution of Yale College , in 1834 .
 Parker, Yale University, Yale Medical School, Medical Institution, Yale
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Parker, Yale University, Yale Medical School, Medical Institution, Yale