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': 'What is your diagnosis in this infant who was found to have hydrocephalus? \nSelect and explain. \nA. Dandy walker malformation, B. Chiari malformation, C. Vein of Galen malformation, D. Holoprosencephaly', 'role': 'user'}, {'content': 'Answer: A \nExplanation: a. Dandy walker malformationThe given MRI brain image shows dilated 4th ventricle with cerebellar vermis hypoplasia suggestive of Dandy walker malformation', 'role': 'assistant'}]