Answer:
The correct answer is b. Nose
Explanation:
Staphylococcus aureus is a gram-positive bacteria that is found as a member of human microbiota in our respiratory tract and on skin. Usually, these bacteria are harmless to us but if it gets in our body it can cause infection.
It can get into our body through contaminated food with S. aureus or through damaged skin. As this bacteria, is present in 15-40% people in their nasal cavity and can be transferred through direct contact so the most likely source of the organism is nose.