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
Otosclerosis shows which type of tympanogram? 
Select and explain. 
A. Type A, B. Type B, C. Type C, D. Type D
A: Type A
Answer: A: Type A 
Explanation: Type A tympanograms have normal peak height and pressure. Two variations of the Type A tympanogram also are normal in pressure, but may be shallow (AS), reflecting otosclerosis or middle ear effusion, or peaked very high (AD), reflecting ossicular discontinuity or a monomeric eardrum