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: A protein-rich fluid leaks into spaces between cells. 
Question: A protein-rich what leaks into spaces between cells?

Output: fluid.


Input: Consider Input: Fact: A bill is used for catching prey by some birds. 
Question: What is used by some birds to catch their prey?

Output: a bill.


Input: Consider Input: Fact: Moles are especially adept at hiding from predators. 
Question: Which of these animals is least at risk from predators?


Output: moles.