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

Ex Input:
Who directed the 1988 film 'Beetle Juice'?

Ex Output:
beetlejuice

Ex Input:
Who is the most famous cartoon creation of Chester Gould?

Ex Output:
chester gould

Ex Input:
Who wrote the novel 'The 39 Steps'?

Ex Output:
the 39 steps