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

Lopburi, Phichit and Ang Thong are provinces in which Asian country?
phichit

The French wine growing areas of Macon, Beaujolais and Chablis are in which region?
macon

What did Banting and Best discover in 1921?

charles herbert best