instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Which singer provides the voice for Chef in South Park?
answer:
chef

question:
Which future Nobel Prize winner did Bill Clinton choose as his Vice President?
answer:
vice president of the united states

question:
Which co-presenter of a programme for car enthusiasts has also presented Braniac: Science Abuse, The Gunpowder Plot: Exploding the Legend, Blast Lab and Invisible Worlds?
answer:
brainiac: science abuse