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

Ex Input:
Brasilia is the capital but which city in Brazil has the largest population?

Ex Output:
brazil

Ex Input:
Chelsea won the 2009 FA Cup final 2-1. Who were the beaten finalists?

Ex Output:
2009 fa cup final

Ex Input:
Eric Faukner; Derek Longmuir and Les McKeown were members of which 70's pop group?

Ex Output:
derek longmuir