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': '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: The scala tympani is closed by secondary tympanic membrane; it is also connected with the subarachnoid space through the aqueduct of cochlea. Ref: Dhingra 6th edition pg- 9', 'role': 'assistant'}]