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: bears hibernate to conserve energy. 
Question: Why do bears hibernate?
Example Output: conserve energy.

Example Input: Fact: if copper is exposed to a source of heat then that copper may easily become hot. 
Question: What can easily become hot if exposed to heat?
Example Output: copper.

Example Input: Fact: Dilution is when two substances are dissolved. 
Question: What is it called when two substances are dissolved?
Example Output:
Dilution.