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The American Opera Society ( AOS ) was a New York City based musical organization that presented concert and semi-staged performances of opera s between 1951 and 1970 .
 organization: Opera
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: Opera 
Answer:
 organization: Opera