TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: The film The Curious Case of Benjamin Button, starring Brad Pitt, is based on a short story by whom?

SOLUTION: the curious case of benjamin button

PROBLEM: Alphabetically, which is the last state in Australia?

SOLUTION: australia

PROBLEM: The first official World Cup for which sport, that requires navigational skills using a map and compass to navigate from point to point in diverse and usually unfamiliar terrain, was held in 1986?

SOLUTION:
compass