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
Brain injury patient in shock, emergency treatment: 
Select and explain. 
A. Hypotensive resuscitation to prevent brain edema, B. Increase intracranial hemorrhage, C. Emergency craniotomy, D. Maintaining euvolemia
D: Maintaining euvolemia
Answer: D: Maintaining euvolemia 
Explanation: None