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: The Battle of Poltava in 1709 was a victory by Peter the Great over which state?
Example Output: battle of poltava

Example Input: The former penal colony Devil's Island lies in which ocean?
Example Output:
devil's island