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Professor Geoffrey Donald Sims OBE ( born 13 December 1926 ) was Vice-Chancellor of the University of Sheffield from 1974 to 1991 .
 Geoffrey, Sims, University of Sheffield
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Geoffrey, Sims, University of Sheffield