This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
A boil is due to staphylococcal infection of - 
Select and explain. 
A. Hair follicle, B. Sweat gland, C. Subcutaneous tissue, D. Epidermis
A: Hair follicle
Answer: A: Hair follicle 
Explanation: • Folliculitis, carbuncles and furuncles are all types of localized (superficial) skin infections that fall under the category of boils.
• Hair follicles serve as portals for a number of bacteria, although S. aureus is the MC cause of localized folliculitis.