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

Ex Input:
Who is the current Australian prime minister ?

Ex Output:
australia

Ex Input:
What is the French name for the English Channel?

Ex Output:
channel

Ex Input:
Which pop group of the 60's and 70's released albums entitled 'Days of Future Passed' and 'A Question of Balance'?

Ex Output:
a question of balance