This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
[{'content': 'Commonest cause of acute folliculitis (hair follicle infection) is \nSelect and explain. \nA. Staphylococcus aureus, B. Beta hemolytic streptococcus, C. Propionibacterium acnes, D. Streptococcus viridans', 'role': 'user'}, {'content': "Answer: A \nExplanation: Acute folliculitis are of two types: superficial and deep. The most common causative organism is Staphylococcus aureus. Superficial folliculitis is also caused by Pseudomonas aeruginosa.Reference : page 41 IADVL's Concise Textbook of Dermatology", 'role': 'assistant'}]