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
Best treatment of subdural haemotoma in a deteriorating patient- 
Select and explain. 
A. By UV Mannitol, B. Oxygenation, C. Use of steroids, D. Surgical evacuation
D: Surgical evacuation
Answer: D: Surgical evacuation 
Explanation: None