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
A 25-year-old woman suffering from bilateral hearing loss for 6 years which became profound with pregnancy. On tympanogram, which of the following curve is obtained? 
Select and explain. 
A. AD, B. AS, C. B, D. A
B: AS
Answer: B: AS 
Explanation: Bilateral hearing loss getting worse in pregnancy is due to otosclerosis. Tympanogram in this case would be AS type. It is a normal tympanogram with reduced compliance due to stapes fixation.