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
Prior H/O ear surgery and Scanty, foul smelling, painless discharge from the ear is characteristic feature of which of the following lesions: 
Select and explain. 
A. ASOM, B. Cholesteatoma, C. Central perforation, D. Otitis externa
B: Cholesteatoma
Answer: B: Cholesteatoma 
Explanation: Cholesteatoma / attico antral type of CSOM / marginal perforation is characterised by scanty foul smelling, painless discharge from the ear. The foul smell is due to saprophytic infection and osteitis