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: Pediatrics
Sodium content in mmol/L in WHO oral rehydration solution is - 
Select and explain. 
A. 20, B. 80, C. 90, D. 111
C: 90
Answer: C: 90 
Explanation: Ans. is 'c' i.e., 90