This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': 'Scutum is \nSelect and explain. \nA. Bony pa of outer attic wall, B. Bony pa of inner attic wall, C. Cailaginous pa of outer attic wall, D. Cailagenous pa of inner attic wall', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The lateral wall of the middle ear is formed largely by the tympanic membrane and to a lesser extent by the bony outer attic wall called the scutum.Refer: PL Dhingra, Diseases of Ear, Nose & Throat, 7th edition, pg no. 6', 'role': 'assistant'}]