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

Example Input: Established in 1919, which is the world's oldest surviving airline?
Example Output: airline

Example Input: Come Clean was the debut album by which 2000s band?
Example Output: come clean

Example Input: Andy Serkis starred in the film Sex and Drugs and Rock'n'Roll as what singer?
Example Output:
andy serkis