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: ENT
[{'content': 'Perforation of tympanic membrane with destruction of tymapnic annulus is called - \nSelect and explain. \nA. Attic, B. Marginal, C. Subtotal, D. Total', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]