This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Physiology
5 percent dextrose is 
Select and explain. 
A. Hypotonic, B. Isotonic, C. Normotonic, D. Hypeonic
B: Isotonic
Answer: B: Isotonic 
Explanation: Dextrose is a white soluble sweet-tasting crystalline solid that is the dextrorotatory isomer of glucose, occurring widely in fruit, honey, and in the blood and tissue of animals. Formula: C6H12O6. Also called: grape sugar or dextroglucose. Administering a 5% sugar solution peri- and postoperatively usually achieves a good balance between starvation reactions and hyperglycemia caused by sympathetic activation. D5W (5% dextrose in water), which consists of 278 mmol/L dextroseRef: Ganong&;s review of medical physiology; 24th edition