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He was born in 1972 in Sofia ( Bulgaria ) and graduated in 1997 in philosophy and biology from Sofia University .
 location: Sofia; organization: Sofia University
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Sofia; organization: Sofia University