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

Input: Consider Input: Ride of the Valkyries is the official quick march of which branch of the British Army?

Output: british army


Input: Consider Input: What country has an official residence called Blair House, kept for guests of the leader of the country?

Output: blair


Input: Consider Input: In which city was Christopher Columbus born?


Output: columbus