What is the longest opera?
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Opera is a subclass of theatre music.
The musical genre of theatre music is opera .
What is the longest opera?</s>Opera is a subclass of [unused1]theatre music                [unused2] .
What is the longest opera?</s>Opera is a subclass of theatre music.
What is the longest opera?</s>The musical genre of [unused1]theatre music                [unused2] is opera .
What is the longest opera?</s>The musical genre of theatre music is opera .
What is the longest opera?</s>opera,0,opera,opera,subclass of,[unused1]theatre music[unused2],[unused1]theatre music[unused2],0,opera,[unused1]theatre music[unused2],0,[unused1]theatre music[unused2]
What is the longest opera?</s>opera,0,opera,opera,subclass of,theatre music,theatre music,0,opera,theatre music,0,theatre music