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

Ex Input:
What American swimmer won eight gold medals at the 2008 Olympics?

Ex Output:
2008 summer olympics


Ex Input:
Richard Block and David Quayle founded which British-based DIY retailing company in 1969?

Ex Output:
david quayle


Ex Input:
What was visited by Viking, Pathfinder, and Curiosity?

Ex Output:

curiosity