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In 1944 , he earned a Doctor of Philosophy degree in economics from the Catholic University of America in Washington , D.C. His thesis was entitled : " Decentralization and the Social Obligations of the Land " .
 organization: Catholic University of America; location: Washington , D.C.
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: Catholic University of America, Washington , D.C. 
Answer:
 organization: Catholic University of America; location: Washington , D.C.