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He began his opera career at the Metropolitan Opera in 1942 , and went on to have a long and fruitful association with that house that lasted until his retirement from the stage in 1974 .
 organization: Metropolitan 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: Metropolitan Opera 
Answer:
 organization: Metropolitan Opera