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

Example Input: Which chemical element is named after the Latin for Copenhagen where it was discovered?
Example Output: copenhagen

Example Input: Which British composer wrote the music used as the theme for Desert Island Discs He also wrote the Dambusters march and the Knightsbridge march.?
Example Output: the dam busters

Example Input: Which travel guide publisher was acquired by the BBC's commercial division BBC Worldwide Ltd for 130m in 2007, and sold for 51m in 2013?
Example Output:
bbc worldwide