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.

Example Input: Fact: a cavern is formed by carbonic acid in groundwater seeping through rock and dissolving limestone
Example Output: Kool-aid is a mix of what items as a solution?

Example Input: Fact: An example of conservation is avoiding waste
Example Output: Conservation is?

Example Input: Fact: cooking causes a chemical reaction
Example Output:
Adding milk to a hot pan creates?