Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
Q: What is the title of the 1866 operetta that Sullivan composed without Gilbert to a libretto by F C Burnand?
A: 
arthur sullivan
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
Q: What is the title of the 1866 operetta that Sullivan composed without Gilbert to a libretto by F C Burnand?
A: 
user
arthur sullivan
assistant
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
Q: What is the title of the 1866 operetta that Sullivan composed without Gilbert to a libretto by F C Burnand?
A: 
arthur sullivan