This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2019, Subject name: ENT
Which among the following is not true about otosclerosis? 
Select and explain. 
A. Hearing better in louder conditions, B. Eustachian tube is always abnormal, C. Tympanic membrane is normal, D. Bilateral progressive conduction deafness
B: Eustachian tube is always abnormal
Answer: B: Eustachian tube is always abnormal 
Explanation: Otosclerosis- Enchondral bone conve to spongy bone (Fissula ante fenestrum is mc site )- Conductive Hearing loss- Paracusis willsi - patient hear better in noisy - Eustachian tube is normal- Carha's notch - dip at 2000hz