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
Surgery is not useful in 
Select and explain. 
A. Cerebral oedema, B. Depressed fracture, C. Extral dural haemorrhage, D. Subdural haemorrhage
A: Cerebral oedema
Answer: A: Cerebral oedema 
Explanation: None