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
Tympanoplasty is mainly used for- 
Select and explain. 
A. Otosclerosis, B. CSOM, C. ASOM, D. None
B: CSOM
Answer: B: CSOM 
Explanation: Ans. is 'b' i.e., CSOM o Myringoplasty' and tympanoplasty are mainly used in tubotympanic type of CSOM when there is recurring discharge or if there is deafness sufficient to cause disability'.