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

Ex Input:
The site of the 1461 Battle of Mortimer's Cross lies in which English county?

Ex Output:
battle of mortimer's cross

Ex Input:
Court Philippe Chatrier, which has stands named after Jacques Toto Brugnon, Jean Borotra, Henri Cochet, and Ren Lacoste, is the main court of an international tennis venue in which city?

Ex Output:
stade roland garros

Ex Input:
In the novel 20,000 Leagues Under The Sea what was the name of the captain of the submarine Nautilus?

Ex Output:
twenty thousand leagues under the sea