instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Name Alfred Hitchcock's first sound film as director?
answer:
alfred hitchcock


question:
What was the name of Chuck Berry`s 1972 hit which gave him his first number one?
answer:
chuck berry


question:
The Belgian Revolution, that began after a performance at the Brussels opera in 1830, led to the secession of the Southern provinces of which kingdom to establish an independent Kingdom of Belgium?
answer:

belgian revolution