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
Commonest complication of CSOM is 
Select and explain. 
A. Subperiosteal abscess, B. Mastoiditis, C. Brain abscess, D. Meningitis
C: Brain abscess
Answer: C: Brain abscess 
Explanation: 50% of brain abscesses in adults and 25% in children are otogenic in origin. In adults, an abscess usually follows CSOM with cholesteatoma. (Ref: Textbook of diseases of ENT, PL Dhingra, 7th edition, pg no. 90)