This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroradiology, Subject name: Radiology
[{'content': 'Wrapping up of the cerebellum around the brain stem in Chiari Malformation is called \nSelect and explain. \nA. Lemon sign, B. Banana sign, C. Lambda sign, D. Tectal Beak', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Banana sign is due to the wrapping of cerebellum around the brain stem. Lemon sign is anterior bossing of frontal bone. Seen in Chiari II Malformation or spina bifida.', 'role': 'assistant'}]