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

Example Input: What is the French name for the English Channel?
Example Output: channel

Example Input: Which is the only Avril Lavigne song to have reached No.1 in the US Billboard Chart?
Example Output: avril lavigne

Example Input: Craven Walker invented what 60s fashionable icon?
Example Output:
edward craven walker