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
Lucid interval is seen in -a) Extra dural haemorrhageb) Intra dural haemorrhagec) Intra cerebral haemorrhaged) Subarachnoid haemorrhage 
Select and explain. 
A. ab, B. a, C. ad, D. bc
A: ab
Answer: A: ab 
Explanation: 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.
Lucid interval is characteristic of epidural hematoma, but is also seen in subdural hematoma.