instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Who painted The Card Players, at Feb 2012 the most expensive artwork in the world?
answer:
the card players

question:
The bells were ringing for Chuck Berry when this song made it to No1. His first and only British No. 1. What song?
answer:
chuck berry

question:
Which European boyband released a 2000 album entitled 'Coast to Coast'?
answer:
boy band