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
In CSOM commonest operation done is 
Select and explain. 
A. Modified radical mastoidectomy, B. Radical mastoidectomy, C. Simple mastoidectomy, D. Tympanoplasty
A: Modified radical mastoidectomy
Answer: A: Modified radical mastoidectomy 
Explanation: In CSOM, commonest operation done is modified radical mastoidectomy. It is a modification of a radical mastoidectomy whereas much of the hearing mechanism is preserved. INDICATIONS Cholesteatoma confined to the attic and antrum. Localised chronic otitis media. Ref: Textbook of diseases of ENT, PL Dhingra, 7th edition, pg no. 461