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': 'Ratio of tympanic members to oval window is \nSelect and explain. \nA. 17:01, B. 22:01, C. 50:01:00, D. 25:01:00', 'role': 'user'}, {'content': 'Answer: A \nExplanation: According to some workers (Wever and Lawrence) out of a total of 90 mm2 area of human tympanic membrane, only 55 mm2 is functional and given the area of stapes footplate (3.2 mm2), the areal ratio is 17:1 and total transformer ratio (17x 1.3) is 22.1. Ref: Dhingra 7e pg 17.', 'role': 'assistant'}]