Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

'Bring It All Back' was the debut single for which group in 1999?
bring it all back

Which river begins in the Rocky Mountains in south-west Colorado, crosses New Mexico and forms the border between Mexico and the USA before reaching the Gulf of Mexico?
new mexico

Who played the title role in the movie Billy Elliot.?

billy elliot