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Career Berlinguer was the president of the University of Siena until April 1993 when he was appointed minister of universities , science and technology to the Ciampi cabinet .
 Berlinguer, the University of Siena
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Berlinguer, the University of Siena