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.

Example Input: Fact: expansion can cause fatigue. 
Question: what can cause fatigue?
Example Output: expansion.

Example Input: Fact: A compass is used to find magnetic north. 
Question: What does a compass find?
Example Output: magnetic north.

Example Input: Fact: the gallbladder reduces the acidity of food entering from the highly acidic stomach. 
Question: What reduces the acidity of food entering from the highly acidic stomach?
Example Output:
the gallbladder.