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However , he accepted an invitation to return to the BBC as controller of BBC Two before he could finish the degree .
 organization: BBC; organization: BBC Two
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: BBC, BBC Two 
Answer:
 organization: BBC; organization: BBC Two