TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: What is the capital city of Colombia?

SOLUTION: colombia

PROBLEM: Which British composer wrote the music used as the theme for Desert Island Discs  He also wrote the Dambusters march and the Knightsbridge march.?

SOLUTION: the dam busters

PROBLEM: Which city, mythically founded by a twin saved by a she-wolf, was built on the seven hills, east of the River Tiber called Aventine, Caelian, Capitoline, Esquiline, Palatine, Quirinal and Viminal?

SOLUTION:
viminal hill