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: Genes are molecules that contain a single protein. 
Question: what are molecules that contain a single protein?
[EX A]: genes.

[EX Q]: Fact: AIDS infects and destroys helper T cells. 
Question: what infects and destroys helper T cells?
[EX A]: AIDS.

[EX Q]: Fact: Frogs have a relatively complex circulatory system with a three-chambered heart. 
Question: What has a relatively complex circulatory system with a three-chambered heart?
[EX A]:
frogs.