This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Perioperative Fluids, Subject name: Anaesthesia
Which crystalloid has osmolality nearest to serum osmolality- 
Select and explain. 
A. Ringer's lactate, B. Normal saline, C. 5% dextrose, D. DNS
A: Ringer's lactate
Answer: A: Ringer's lactate 
Explanation: Crystalloid pH mOsm/L Na+ CI- Ca2+ Lactate- K+ Mg2+ Gluconate- Acetate- NS (0.9% Saline) 5.6 (4.5 - 7.0) 308o 154o 154 LR 6.6 (6.0 - 7.5) 274 130 109 3 28 4 Normosol 7.4 (6.5-7.6) 295 140 98 5 3 23 27 ringers lactate has osmolality nearest to plasma osmolality