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: Exercise can teach animals how to behave. 
Question: What can teach animals how to behave?

Answer: exercise.


Question: Fact: Onychomycosis affect the protective plates over the ends of fingers. 
Question: What can affect the protective layers over the fingers?

Answer: Onychomycosis.


Question: Fact: Most hormones are controlled by feedback mechanisms. 
Question: Most hormones are controlled by what?

Answer:
feedback mechanisms.