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:
Which of North America's Great Lakes has the same name as a province of Canada?

Ex Output:
canada


Ex Input:
Alex Band and Aaron Kamin make up which band?

Ex Output:

alex band