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.

Input: Consider Input: Fact: memory cells help keep people from getting sick. 
Question: What helps keep people from getting sick?

Output: Memory cells.


Input: Consider Input: Fact: Evolution occurs by a sorting mechanism process. 
Question: How does evolution occur?

Output: A sorting mechanism process.


Input: Consider Input: Fact: carcinogens cause production of mutations in DNA  of areas such as lungs. 
Question: what cause production of mutations in DNA of areas such as lungs?


Output: carcinogens.