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From 6 January 1997 to 12 November 1999 he served as rector of the National Autonomous University of Mexico ( UNAM ) , the largest university in the Spanish-speaking world .
 National Autonomous University of Mexico
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 Autonomous University of Mexico