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

Ex Input:
What currency is used on Christmas Island?

Ex Output:
christmas island


Ex Input:
What was Bon Jovi's first UK top ten hit single?

Ex Output:
bon jovi


Ex Input:
Who was the wife of Akenhaten and mother of Tutankhamen?

Ex Output:

akhenaten