Given a fact, create a question that can be answered using the fact. Construct the question such that it is unambiguous, has a unique answer and the answer can be given using the fact.

Fact: the sun is a source of light called sunlight
Sunlight is a source of light from what?

Fact: combining two substances chemically causes chemical reactions
Cola and mentos combined will?

Fact: polar bears live in cold environments

Where would a polar bear enjoy living?