This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hydrocephalus, Subject name: Pediatrics
[{'content': 'Which is the most common cause of ventriculomegaly in newborn? \nSelect and explain. \nA. Dandy Walker syndrome, B. Arnold Chiari malformation, C. Aqueductal stenosis, D. Arachnoid villi malfunction', 'role': 'user'}, {'content': 'Answer: C \nExplanation: - Ventriculomegaly is seen in neonates with hydrocephalus. - Obstructive or noncommunicating hydrocephalus develops most commonly in children d/t abnormality of aqueduct of Sylvius or a lesion in the fouh ventricle. - Nonobstructive or communicating hydrocephalus most commonly follows a subarachnoid hemorrhage, which is usually a result of intraventricular hemorrhage in a premature infant.', 'role': 'assistant'}]