Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
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Question: Which British composer wrote the music used as the theme for Desert Island Discs  He also wrote the Dambusters march and the Knightsbridge march.?

Answer: the dam busters


Question: Who succeeded John Major as leader of the UK Conservative Party?

Answer: conservative party


Question: What is an unrealistically optimistic person, after the title-character of Eleanor Porter's famous 1913 novel?

Answer:
eleanor h. porter