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He sang baritone roles with the National Opera Theatre ( possibly under the name Louis Waters ) and later became a producer for the National Theatre Movement ( 1948 – 50 ) .
 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