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

Example Input: Written by Edgar Allen Poe and published in 1845, what poem repeats the famous line 'nevermore'?
Example Output: edgar allan poe

Example Input: Which is the largest continent on Earth?
Example Output: earth

Example Input: Duncan Zowie Jones, director of sci-fi films 'Moon' and 'Source Code', is the son of which musician?
Example Output:
duncan jones