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': 'Which one of the following statements is true of brain tumours in childhood ? \nSelect and explain. \nA. Is a rare from of malignancy, B. Most tumours are below the tentorium, C. Hemiparesis is a frequent from of presentation, D. Papilloedema is infrequent', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]