This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Normal Physiology - Sodium, Potassium, and Acid-Base Balance, Subject name: Surgery
Which of following is hypertonic? 
Select and explain. 
A. 5%dextrose, B. 0.45% normal saline, C. 0.9%normal saline, D. 3% normal saline
D: 3% normal saline
Answer: D: 3% normal saline 
Explanation: ANSWER: (D) 3% normal salineREF: Fluids & electrolytes by By Lippincott Williams & Wilkins page 264IsotonicHypertonicHypotonicDextrose 5% in water5% dextrose in half normal saline0.45% normal saline0.9% normal saline (NaCl)5% dextrose in normal saline Ringer lactateDextrose 10% in water