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: Surgery
[{'content': 'Extradural haematoma is associated with what % of severe trauma - \nSelect and explain. \nA. 36%, B. 10%, C. 77%, D. 96%', 'role': 'user'}, {'content': 'Answer: B \nExplanation: "Epidural hematoma occur in upto 10% of severe head injury cases and are less often associated with underlying cortical damage than are subdural hematomas." - Harrison', 'role': 'assistant'}]