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: The bonds of that which when heavy is Deuterium cause water to expand when it freezes. 
Question: The bonds of that which when heavy is Deuterium cause what to expand when it freezes?
Example Output: water.

Example Input: Fact: Protective equipment is used for protecting the eyes during experiements. 
Question: What is used for protecting the eyes during experiements?
Example Output: protective equipment.

Example Input: Fact: Vesicle transport requires energy for movement of substances against a chemical gradient. 
Question: Why does vesicle transport need energy?
Example Output:
for movement of substances.