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 seen in -a) Extra dural haemorrhageb) Intra dural haemorrhagec) Intra cerebral haemorrhaged) Subarachnoid haemorrhage \nSelect and explain. \nA. ab, B. a, C. ad, D. bc', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Lucid interval is a temporal sequence of events in which the patient has a period of normal functioning following head injury until symptoms (stupor, coma) begin.\nLucid interval is characteristic of epidural hematoma, but is also seen in subdural hematoma.', 'role': 'assistant'}]