TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
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: Who achieved fame for his ,'Confessions Of An English Opium Eater'?

SOLUTION: confessions of an english opium-eater

PROBLEM: In the Beijing Olympics, Britain's only Boxing gold medal was won by whom?

SOLUTION:
britain