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': 'A patient is brought to the emergency as a case of head injury, following a head on collision road traffic accident. His BP is 90/60 mmHg. Tachycardia is present. Most likely diagnosis is \nSelect and explain. \nA. EDH, B. SDH, C. Intracranial hemorrhage, D. Intra-abdominal bleed', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Due to cushings reflex HR is decreased in brain injury.', 'role': 'assistant'}]