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

[EX Q]: Which British composer wrote the music used as the theme for Desert Island Discs  He also wrote the Dambusters march and the Knightsbridge march.?
[EX A]: the dam busters

[EX Q]: Which English king was married to Eleanor of Castile?
[EX A]: eleanor of castile

[EX Q]: From which city does Bruce Springsteen hail?
[EX A]:
bruce springsteen