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: mammals can generate heat by muscle action. 
Question: What can mammals generate heat with?
Example Output: Muscle action.

Example Input: Fact: Heat from the sun helps frog eggs survive and hatch into tadpoles. 
Question: What heats frog eggs so that they may hatch into tadpoles?
Example Output: the sun.

Example Input: Fact: An ion is formed after a neutral atom loses an electron. 
Question: A neutral atom that loses an electron becomes  what?
Example Output:
an ion.