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

Example Input: Which BBC current affairs programme, the longest-running in the world, is 60 years old this year ?
Example Output: bbc

Example Input: Forty hours before he committed suicide in 1945 Adolf Hitler married whom?
Example Output: adolf hitler

Example Input: Corcovado mountain overlooks which city?
Example Output:
corcovado