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: Pediatrics
Most common cause of hydrocephalus in children is? 
Select and explain. 
A. Post inflammatory obstruction, B. Buddchiary syndrome, C. Brain tumour, D. Perinatal injury
A: Post inflammatory obstruction
Answer: A: Post inflammatory obstruction 
Explanation: Ans. is 'a' i.e., Post inflammatory obstruction o Answer of this question is none because :- o MC cause of obstructive (non-communicating) hydrocephalus aqueductal stenosis. MC cause of non-obstructive (communicating) hydrocephalus subarachanoid hemorrhage. o But, amongst the given options best answer is option 'a'. "A common cause of acquired hydrocepahalus, is post inflammatory obstruction. Bacterial and tuberculous meningitis have a propensity to produce thick tenacious exudate that obstructs the basal cisterns".