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
[{'content': 'Which of the following is characterised by typical ash - grey slough \nSelect and explain. \nA. Furuncle, B. Carbuncle, C. Erysipeals, D. Cellulitis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ash - grey slough is typical of carbuncle.', 'role': 'assistant'}]