TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: In which war did the Sack of Badajoz takeplace?

SOLUTION: siege of badajoz

PROBLEM: Who is the only British Prime Minister to serve under 3 monarchs?

SOLUTION: prime minister of the united kingdom

PROBLEM: And Then There Were None?

SOLUTION:
and then there were none