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
The effective diameter of the tympanic membrane is 
Select and explain. 
A. 25 mm2, B. 30 mm2, C. 40 mm2, D. 45 mm2
D: 45 mm2
Answer: D: 45 mm2 
Explanation: 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