Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

[EX Q]: Who achieved fame for his ,'Confessions Of An English Opium Eater'?
[EX A]: confessions of an english opium-eater

[EX Q]: Who had a 2000 hit with Country Grammar?
[EX A]: country grammar

[EX Q]: What is Edward Hopper's famous night-time painting of customers in an American diner?
[EX A]:
edward hopper