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

Ex Input:
What country has an official residence called Blair House, kept for guests of the leader of the country?

Ex Output:
blair


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

Ex Output:
airline


Ex Input:
Alfred Hitchcock made this movie twice, the first time in 1934 and again in 1956. What's the film ?

Ex Output:

alfred hitchcock