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

Example Input: Established in 1919, which is the world's oldest surviving airline?
Example Output: airline

Example Input: What was the name of Chuck Berry's 1972 hit which gave him his first number one?
Example Output: chuck berry

Example Input: Which entertainer had a statue erected in his memory in his home town of Caerphilly in 2008?
Example Output:
caerphilly