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While he was completing his vocal studies at the “ Royal College of Music ” in London ( 1995-97 ) , he made his debut as Oberon in Benjamin Britten ’s “ A Midsummer Night ’s Dream ” .
 organization: Royal College of Music; person: Benjamin Britten ’s; organization: ’s
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: Royal College of Music, Benjamin Britten ’s, ’s 
Answer:
 organization: Royal College of Music; person: Benjamin Britten ’s; organization: ’s