This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
The use of 5% dextrose as an intravenous resuscitation fluid can 
Select and explain. 
A. Improve cerebral perfusion, B. Provide glucose substrate for cerebral metabolism, C. Reduce intracranial pressure and cause lacity of brain, D. Reduce serum osmalality and cause brain edema
D: Reduce serum osmalality and cause brain edema
Answer: D: Reduce serum osmalality and cause brain edema 
Explanation: 5% dextrose is a free water solution. Dextrose gets metabolised and plasma osmolality is decreased. This increases the brain oedema in head injury and hence should be avoided.