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': 'At which location along the basilar membrane are the highest-frequency sounds detected? \nSelect and explain. \nA. Nearest the oval window, B. Fahest from the oval window, near the helicotrema, C. Uniformly along the basilar membrane, D. At the midpoint of the membrane', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The basilar membraneis widest (0.42-0.65 mm) and least stiff at the apex of the cochlea, and narrowest (0.08-0.16 mm) and stiffest at the base (near the round and oval windows). High-frequency soundslocalize near the base of the cochlea, while low-frequency sounds localize near the apex. Ref otolaryngology dhingra 3/e p34', 'role': 'assistant'}]