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

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: The most northerly part of mainland Australia is in which state?
Example Output: australia

Example Input: In Greek mythology, who was the father of Achilles?
Example Output:
achilles