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.

[EX Q]: Fact: Any surface that has not been sterilized will produce substances that are toxic. 
Question: What will produce substances that are toxic?
[EX A]: a surface not sterilized.

[EX Q]: Fact: legumes require water for survival. 
Question: what requires water for survival?
[EX A]: legumes.

[EX Q]: Fact: antigens are a group of atoms that the immune system recognizes as foreign to the body. 
Question: what type of antigens does the immune system recognize as foreign to the body?
[EX A]:
group of atoms.