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: Medicine
[{'content': 'Brain tumor causing hypernatremia in children \nSelect and explain. \nA. Medulloblastoma, B. Cerebellar astrocytoma, C. Craniophyrangioma, D. Brain stem glioma', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Craniophyrangioma", 'role': 'assistant'}]