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

[EX Q]: Can you name the final movie directed by Alfred Hitchcock?
[EX A]: alfred hitchcock

[EX Q]: Betty Driver played which role in Coronation Street?
[EX A]: betty driver

[EX Q]: What does a chronometer measure?
[EX A]:
clock