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
A child suffering from acute diarrhoea is brought to the casualty and is diagnosed as having severe dehydration with pH of 7.23. Serum Na– 125, Serum K– 3, HCO3– 16. The best I.V. fluid of choice is – 
Select and explain. 
A. 3% Saline, B. N/3 Saline + 10% dextrose, C. Normal saline, D. N/3 saline + 5% dextrose
C: Normal saline
Answer: C: Normal saline 
Explanation: The fluid used in severe dehydration

Best IV fluid for severe dehydration is Ringer's lactate.
An ideal preparation would be Ringer's lactate with 5% added dextrose, However, it is not available.
If Ringer's lactate is not available, normal saline solution (0.9% NaCl ) can be used.