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: Social & Preventive Medicine
The freshly prepared ORS (Oral Rehydration Solution) should not be used after 
Select and explain. 
A. 6 hours, B. 24 hours, C. 18 hours, D. 12 hours
B: 24 hours
Answer: B: 24 hours 
Explanation: Reduced Osmolarity Oral Rehydration Solution (Low Na ORS): WHO NEW ORS
Composition (grams)

Sodium chloride - 2.6
Potassium chloride - 1.5
Sodium citrate - 2.9
Glucose - 13.5
Total -  20.5

Osmolar concentration (mmol/litre)

Sodium - 75
Potassium - 20
Chloride - 65
Citrate - 10
Glucose - 75
Total -245