In this task, you are given a question and a corresponding answer. Your task is to generate a fact statement that is useful in answering the given question.

[EX Q]: Question: Which is a complete circuit? Answer: a refrigerator that is running.
[EX A]: a complete electrical circuit is a source of electrical energy

[EX Q]: Question: Which of the following relationships is true? Answer: Diamond can scratch Play-Doh, therefore diamond is harder.
[EX A]: if one mineral can scratch another mineral then that other mineral is softer than that one mineral

[EX Q]: Question: What can you see yourself in? Answer: clear mountain lake.
[EX A]:
shiny things reflect light