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.

Input: Consider Input: Fact: magnifying glass is used to see small things by making objects appear bigger

Output: A magnifying glass?


Input: Consider Input: Fact: In the photosynthesis process oxygen has the role of waste product

Output: Unlike CO2, oxygen is a waste product of?


Input: Consider Input: Fact: melting means changing from a solid into a liquid by adding heat energy


Output: Dropping butter into a boiling water would cause it to?