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: cell division is how humans grow and repair themselves. 
Question: what uses cell division to grow and repair themselves?

Answer: humans.


Question: Fact: Lung cancer is most often caused by exposure to cigarettes. 
Question: What is lung cancer most often caused by exposure to?

Answer: cigarettes.


Question: Fact: loss of balance are results of toxic material in the stomach. 
Question: what is a reaction to toxic material in the stomach?

Answer:
loss of balance.