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

Ex Input:
'Arthur Clennam', 'Jeremiah Flintwinch', and 'Edward Sparkler' are all characters in which Dickens' novel?

Ex Output:
arthur clennam

Ex Input:
Which cyclist won the first medal for Team GB at the 2012 Olympic Games?

Ex Output:
gb

Ex Input:
Which American vocalist (described by the British newspaper The Guardian as one of the greatest voices of her generation) whose repertoire included jazz, blues, folk, gospel and pop, was unknown outside Washington, D.C., until after she died of melanoma in 1996?

Ex Output:
blues