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: Microbiology
[{'content': 'Staphylococcus aureus does not cause which of the following skin infection: \nSelect and explain. \nA. Ecthyma gangrenosum, B. Bullous impetigo, C. Botryomycosis, D. Cellulitis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is. a. Ecthyma gangrenosum', 'role': 'assistant'}]