instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Which English comedian has joined Amanda Holden as one of the judges on the current series of 'Britain's Got Talent'?
answer:
britain's got talent

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

question:
Which film director won the Oscar for Best Picture for the film 12 Years a Slave in 2013?
answer:
12 years a slave