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': 'Lucid interval is classically seen in: \nSelect and explain. \nA. Epidural hemorrhage, B. Subdural hemorrhage, C. Intraparenchymal hemorrhage, D. None of the above', 'role': 'user'}, {'content': "Answer: A \nExplanation: Epidural hemorrhage has a classic three-stage clinical presentation that is probably seen in only 20% of cases. The patient is initially unconscious from the concussive aspect of the head trauma. The patient then awakens and has a lucid interval while the hematoma subclinically expands. As the volume of the hematoma grows, the decompensated region of the pressure-volume curve is reached, ICP increases, and the patient becomes lethargic and herniates. Uncal herniation from an EDH classically causes ipsilateral third nerve palsy and contralateral hemiparesis. Ref: Schwaz's principle of surgery 9th edition, chapter 42.", 'role': 'assistant'}]