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

Ex Input:
July 1938 saw the first ascent of the North Face of which Alpine mountain?

Ex Output:
alps


Ex Input:
In which English city was Damien Hirst born?

Ex Output:
damien hirst


Ex Input:
What system, available on the internet, was founded by Mark Zuckerberg, Eduardo Saverin, Dustin Moskovitz and Chris Hughes?

Ex Output:

chris hughes