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

Ex Input:
Can you name the final movie directed by Alfred Hitchcock?

Ex Output:
alfred hitchcock


Ex Input:
Of all the actors who played Doctor Who in the TV series of the same name, who appeared in the most episodes?

Ex Output:
doctor who


Ex Input:
What is the official language of Angola?

Ex Output:

angola