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He joined the staff of the University of Marburg , where he taught Russian history , in 1946 , becoming a professor in 1953 .
 organization: University of Marburg
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: University of Marburg 
Answer:
 organization: University of Marburg