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: CPU time can be used as a clock. 
Question: What computer component can you use to measure time?

Output: CPU.


Input: Consider Input: Fact: a hole over antarctica causes global warming. 
Question: What does a hole over Antarctica cause?

Output: Global warming.


Input: Consider Input: Fact: A fire require photosynthesis to burn. 
Question: What does a fire need in order to burn?


Output: photosynthesis.