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

Ex Input:
Who achieved fame for his ,'Confessions Of An English Opium Eater'?

Ex Output:
confessions of an english opium-eater

Ex Input:
Who succeeded John Major as leader of the UK Conservative Party?

Ex Output:
conservative party

Ex Input:
Which song written by Cole Porter in 1933 referred to Fred Astaire, Mussolini, Mrs Sweeny and Camembert ?

Ex Output:
cole porter