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

[EX Q]: Besides the Caucasus, what mountain range forms the border of Europe and Asia?
[EX A]: asia

[EX Q]: Betty Driver played which role in Coronation Street?
[EX A]: betty driver

[EX Q]: Def Leppard and Mud both had hit singles with what same name?
[EX A]:
def leppard