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The historian of science David C. Lindberg pointed out that medieval bestiaries were rich in symbolism and allegory , so as to teach moral lessons and entertain , rather than to convey knowledge of the natural world .
 David C. Lindberg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 David C. Lindberg