You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

Who was the first American President?
Solution: president of the united states
Why? The question talks about the president of the USA.

New input: Which pop group have had UK number one hits with 'Bring It Back', 'Never Had A Dream Come True', 'Don't Stop Movin'', and 'Have You Ever'?
Solution:
don't stop movin'