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

Example Input: Which band had a hit with the song 'Brown Girl in the Ring'?
Example Output: brown girl in the ring

Example Input: In which constellation is the star Deneb?
Example Output: deneb

Example Input: Ride of the Valkyries is the official quick march of which branch of the British Army?
Example Output:
british army