Write a correct answer to the given question based on its associated fact. Make sure that your answer is contained in the associated fact. Don't be creative and introduce any new word that is not mentioned in the associated fact! Remember that the associated fact has been rearranged to form the question. So, the correct answer words must lie within the associated fact. The correct answer can be a word, phrase, or even a sentence.

Input: Consider Input: Fact: If something is black then it absorbs all different wavelengths of light. 
Question: If something is what, then it absorbs all different wavelengths of light?

Output: black.


Input: Consider Input: Fact: The thyroid gland makes a chemical substance that increase the rate of metabolism in the body. 
Question: What gland makes a chemical in the body to increase the rate of metabolism?

Output: Thyroid.


Input: Consider Input: Fact: Erosion can cause the formation of acid. 
Question: Erosion can cause the formation of what?


Output: acid.