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 first Apollo mission to leave Earth orbit and orbit the moon, in 1968?
Example Output: apollo

Example Input: 'Mrs Dalloway' and To the Lighthouse' are among the works of which writer?
Example Output: to the lighthouse

Example Input: Which authour's real name was Charles Dodgson and was a mathematics instructor at Christ Church Oxford?
Example Output:
christ church, oxford