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': 'Frequency range in normal human hearing is? \nSelect and explain. \nA. 20-4000 Hz, B. 20-8000 Hz, C. 20-10000 Hz, D. 20-20000 Hz', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) 20-20000 HzRef: Dhingra 4th ed p 16, 21', 'role': 'assistant'}]