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: the planet being buried in snow and ice for millions of years at a time is relatively rare. 
Question: What is true about the planet being buried in snow and ice for millions of years at a time?

Output: it is relatively rare.


Input: Consider Input: Fact: Stimuli can cause the brain to experience pain. 
Question: What can cause the brain to experience pain?

Output: stimuli.


Input: Consider Input: Fact: Blowing on a fire increases the oxygen near the fire. 
Question: Blowing on a fire increases what near a fire?


Output: the amount of oxygen.