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
All of these fluids are isotonic except 
Select and explain. 
A. 0.9% Normal saline, B. 5% dextrose, C. Ringer lactate, D. 3% Normal saline
D: 3% Normal saline
Answer: D: 3% Normal saline 
Explanation: Isotonic fluids are 0.9% Normal saline, 5% dextrose, Ringer lactate.