This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Surgery
[{'content': 'All of the following are indications of CT scan in head injured patient except: \nSelect and explain. \nA. GCS<13, B. Vomiting 1 episode, C. Focal neurological deficit, D. Mild head injury in patient Age >65 years', 'role': 'user'}, {'content': 'Answer: B \nExplanation: NICE guidelines for CT in Head injury GCS<13 at any point GCS 13 or 14 at 2 hours Focal neurological deficit Suspected open, depressed or basal skull fracture Seizure Vomiting > One episode Urgent CT scan if none of the above but: Age>65 years Coagulopathy (e.g., warfarin) Dangerous mechanism of injury (CT within 8 hours) Antegrade amnesia > 30 min (CT within 8 hours) Ref: Bailey 27th edition Pgno: 330', 'role': 'assistant'}]