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.

Fact: Onychomycosis affect the protective plates over the ends of fingers. 
Question: What can affect the protective layers over the fingers?
Onychomycosis.

Fact: Viruses often infect something killed by antibiotics. 
Question: Viruses often infect something killed by what?
Antibiotics.

Fact: Birds have backbones. 
Question: What animals have a backbone?

Birds.