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

Ex Input:
Which group of the 1970's featured Tony Iommi on guitar, Geezer Butler on bass and Bill Ward on drums?

Ex Output:
geezer butler


Ex Input:
At the recent Tony Awards who won the award for Best Actress in a Play for her performance as Queen Elizabeth II in the play The Audience by Peter Morgan?

Ex Output:
tony award for best actress in a play


Ex Input:
In June 2009, Canada announced plans to extend which national park from 4,800 square kilometres to 30,000 square kilometres to help protect the habitat of grizzly bear, caribou and other species?

Ex Output:

canada