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
[{'content': 'Most common cause of fatal ventriculomegaly is ? \nSelect and explain. \nA. Arnold Chiari Malformation - I, B. Arnold Chiari Malformationalformation - II, C. Aqueductal Stenosis, D. Dandy Walker Malformation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Most common cause of hydrocephalus and ventriculomegaly is aqueductal stenosis. Ventricles develop early in pregnancy and can be seen on a a minor self-limiting imbalance in fluid circulation and absorption that becomes compensated defects in brain development damage or loss of brain tissue Reference: GHAI Essential pediatrics, 8th edition', 'role': 'assistant'}]