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: insects are in the largest phylum of invertebrates. 
Question: What are in the largest phylum of invertebrates?
[EX A]: insects.

[EX Q]: Fact: food can cause illness. 
Question: What is a source of  illness?
[EX A]: food.

[EX Q]: Fact: T lymphocytes are infected and destroyed by HIV. 
Question: What destroys T lymphocytes?
[EX A]:
HIV.