instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
What is the name of the main thoroughfare in Barcelona, which runs from the Placa de Catalunya to the sea?
answer:
barcelona


question:
Which singer provides the voice for Chef in South Park?
answer:
chef


question:
Who won the Booker Prize in 2001 with 'True History of the Kelly Gang'?
answer:

true history of the kelly gang