This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
Surface area of tympanic membrance - 
Select and explain. 
A. 55 mm2, B. 70 mm2, C. 80 mm2, D. 90 mm2
D: 90 mm2
Answer: D: 90 mm2 
Explanation: None