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

Ex Input:
Which popular Doctor Who villains, it was revealed in 2011, are to be given 'a rest' by scriptwriters?

Ex Output:
doctor who


Ex Input:
Who bad a number 1 in the 1980's with Circle in the Sand?

Ex Output:
circle in the sand


Ex Input:
The life of 15th century French serial killer Gilles de Rais is believed to be the basis of which story by Charles Perrault?

Ex Output:

charles perrault