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.

Ex Input:
Fact: a candle is a source of light when it is burned

Ex Output:
who would see better through an underground tunnel?

Ex Input:
Fact: adding heat to an object sometimes causes chemical reactions

Ex Output:
A chemical reaction may occur when _____ is added to an object.?

Ex Input:
Fact: runoff contains fertilizer from cropland

Ex Output:
Which of these is a side effect of vegetable farming?