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
Most common Intra - cranial complication of chronic sinusitis 
Select and explain. 
A. Brain abscess, B. Meningitis, C. Cavernous sinus thrombosis, D. Subdural abscess
D: Subdural abscess
Answer: D: Subdural abscess 
Explanation: None