This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pediatrics
[{'content': 'The commonest cause of obstructive hydrocephalus in children is \nSelect and explain. \nA. Aqueductal stenosis, B. Dandy walker syndrome, C. Subarachnoid hemorrhage, D. Tubercular meningitis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ETIOLOGY OF HYDROCEPHALUSCommunicating/non-obstructiveNon-communicating/obstructivePostmeningiticAqueductal stenosisposthemorrhagicDandy-walker/Chiari malformationChoroid plexus papillomaTuberculosisObstructive /non-communicating hydrocephalus develops most commonly in children due to aqueductal stenosis.Non-obstructive hydrocephalus most commonly occurs due to subarachnoid hemorrhage which is usually a result of intraventricular hemorrhage in a preterm infant.', 'role': 'assistant'}]