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.
--------
Question: Fact: bears hibernate to conserve energy. 
Question: Why do bears hibernate?

Answer: conserve energy.


Question: Fact: an animal requires food to grow and heal. 
Question: What does an animal require food for?

Answer: to grow and heal.


Question: Fact: pathogens can cause Mad Cow. 
Question: What can cause Mad Cow?

Answer:
pathogens.