Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Example Input: The behavior of ideal gases is explained by kinetic molecular theory.
Example Output: The behavior of ideal gases is explained by what theory of gases?

Example Input: When the smooth muscle relaxes, the arterioles dilate, allowing blood to enter the capillaries.
Example Output: When the smooth muscle relaxes, the arterioles dilate, allowing blood to enter the what?

Example Input: Mercury is the name of the smallest planet in our solar system, which is also nearest to the sun.
Example Output:
What is the name of the smallest planet in our solar system, which is also nearest to the sun?