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': 'About Dandy-Walker syndrome, true is: \nSelect and explain. \nA. Mostly have hydrocephalus, B. Cystic expansion of 4th ventricle, C. Mid cerebellar hypoplasia, D. All are true', 'role': 'user'}, {'content': "Answer: D \nExplanation: d. All are true(Ref: Nelson's 20/e p 2815-2816)Dandy Walker malformationCystic expansion of 4th ventricle and midline cerebellar hypoplasia seen; 90% patients have hydrocephalusPapilledema, pyramidal tract signs and cranial nerve palsies may occur along with symptoms of raised ICP.It is managed by shunting the cystic cavity in the presence of hydrocephalus.", 'role': 'assistant'}]