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

Ex Input:
Which of these was the title of Bobby Darin's first million selling single?

Ex Output:
bobby darin


Ex Input:
The 2002 Winter Olympics were held in which city?

Ex Output:
2002 winter olympics


Ex Input:
In 1992, Boutros Boutros-Ghali became head of what organisation?

Ex Output:

boutros boutros-ghali