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
Angle made by tympanic membrane with floor of the meatus? 
Select and explain. 
A. 35 degrees, B. 55 degrees, C. 75 degrees, D. 90 degrees
B: 55 degrees
Answer: B: 55 degrees 
Explanation: Ans. is 'b' i.e., 55 degrees * The length of the anterior wall and floor is more than that of the posterior wall and roof because the tympanic membrane is set at an angle of 55 degrees with its floor.