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': 'The secondary tympanic membrane is present over \nSelect and explain. \nA. Round window, B. Oval window, C. Lateral wall of middle ear, D. Scala media', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Round window (present on the medial wall of the middle ear) is covered by the secondary tympanic membrane.Other structures present on the medial wall of the middle ear are:1.Promontory 2.Bony lateral semicircular canal 3.Oval window and 4.Facial nerve canalRef: Hazarika; 3rd ed; Pg 16', 'role': 'assistant'}]