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: thirst is used to make an animal realize that it needs to replenish H2O in its body. 
Question: Thirst shows an animal that it needs what?
Example Output: H2O.

Example Input: Fact: Plucking a string on a guitar creates sound. 
Question: How does a guitar create sound?
Example Output:
Plucking a string.