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 intracranial complication of CSOM is: 
Select and explain. 
A. Sub-periosteal abscess, B. Mastoiditis, C. Brain abscess, D. Meningitis
D: Meningitis
Answer: D: Meningitis 
Explanation: (d) Meningitis(Ref. Cummings, 6th ed., 2157)The most common intracranial complication of chronic suppurative Otitis media is meningitis followed by brain abscess (temporal lobe abscess).Mastoiditis is the most common extracranial complication.Subperiosteal or postauricular abscess is the most common abscess following mastoiditis.