This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluid, Electrolyte, Subject name: Pediatrics
Low osmolar ORS composition? 
Select and explain. 
A. Na 90 + 311 mOsmol/L, B. Na 75 + 245 mOsmol/L, C. Na 60 + 245 mOsmol/L, D. Na 60 + 240 mOsmol/L
B: Na 75 + 245 mOsmol/L
Answer: B: Na 75 + 245 mOsmol/L 
Explanation: Component Low Osmolarity WHO ORS (mEq/L) Glucose 75 Sodium 75 Potassium 20 Chloride 65 Citrate 10 Osmolarity 245