This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pediatrics
Commonest cause of obstructive hydrocephalus in children 
Select and explain. 
A. Acqueductal stenosis, B. Aquaductal gliosis, C. Subarachnoid hemorrhage, D. Tubercular meningitis
A: Acqueductal stenosis
Answer: A: Acqueductal stenosis 
Explanation: Aqueducts stenosis is most common cause of obstructive hydrocephalus in children. Reference: GHAI Essential pediatrics, 8th edition