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

Cilantro is the leaf of which herb?
cilantro

Ride of the Valkyries is the official quick march of which branch of the British Army?
british army

Honeycrisp, Ambrosia, Pippin, Gravenstein, and McIntosh are varieties of what?

mcintosh