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 Q]: Fact: a plant requires sunlight to grow
[EX A]: Which most directly requires sunlight to grow?

[EX Q]: Fact: friction causes the temperature of an object to increase
[EX A]: To warm yourself up on a chilly day?

[EX Q]: Fact: burning gasoline is a source of pollution
[EX A]:
Another source of pollution may be?