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

Q: Harry, Tom, Dougie and Danny are collectively known as who in the pop world?

A: dougie poynter
****
Q: Thereze Bazar and David van Day were better known as which duo?

A: david van day
****
Q: Which British scientist discovered acetylene in 1836?

A:
acetylene
****