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 effective diameter of the tympanic membrane is \nSelect and explain. \nA. 25 mm2, B. 30 mm2, C. 40 mm2, D. 45 mm2', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Effective diameter or vibratory area of tympanic membrane is 45mm2; Area of tympanic membrane is 90mm2 Stapes footplate area is 3.2mm2 Ref: PL Dhingra 6th edition of Ear, Nose and Throat; pg no 15', 'role': 'assistant'}]