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

Example Input: 'Bring It All Back' was the debut single for which group in 1999?
Example Output: bring it all back

Example Input: Carpo and Elara are moons of which planet?
Example Output: elara

Example Input: The Colour of Magic, published in 1983, was the first of which series of novels?
Example Output:
the colour of magic