This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
[{'content': 'A 5 year old child is admitted with headache, vomitting and diffifculty in walking. Physical findings include truncal ataxia, papilloedema and left lateral recuts palsy. No finger-to-nose ataxia could be detected on the left side or right side. The most likely diagnosis is- \nSelect and explain. \nA. Dandy walker syndrome, B. Syringobulbia, C. Arnold-chiari malformation, D. Medulloblastoma', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Medulloblastoma o Congenital lesions would present Hydrocephalus since bih (for a & c)", 'role': 'assistant'}]