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His present radio career is a return to WBZ Radio since he was on air there while at Boston University School of Law in the 70s .
 organization: Boston University School of Law
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: Boston University School of Law 
Answer:
 organization: Boston University School of Law