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

[Q]: What was the title of Britney Spears' second album (and the single that was released from it)?
[A]: britney spears


[Q]: Which play and film was adapted from a story by Christopher Isherwood and later adapted as the musical and film Cabaret?
[A]: cabaret


[Q]: What is the title of Abba's last UK number one hit single?
[A]:
abba