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: oxygen is essential for cellular respiration for fungi. 
Question: what requires oxygen for cellular respiration?

Output: fungi.


Input: Consider Input: Fact: glass causes bending of light rays. 
Question: what does glass cause?

Output: bending light rays.


Input: Consider Input: Fact: Biofuel is used to produce power by burning. 
Question: Biofuel is used to produce what when it is burned?


Output: power.