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.

[Q]: Fact: a decrease in visibility while driving can cause people to crash their car
[A]: a decrease in visibility while driving can cause people to crash their what?

[Q]: Fact: a chloroplast contains chlorophyll
[A]: What contains chlorophyll?

[Q]: Fact: some raccoons live in hollow logs
[A]:
If a thing is residing in a hollowed out part of a tree, then it is probably?