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

Example Input: Which chemical element is named after the Latin for Copenhagen where it was discovered?
Example Output: copenhagen

Example Input: Which actress played Arwen in the trilogy of films?
Example Output: arwen

Example Input: Which philosopher is famous for his paradoxes, most notably Achilles and the tortoise?
Example Output:
zeno's paradoxes