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 had repeated vomiting and developed metabolic alkalosis. The treatment given is – 
Select and explain. 
A. Ringer lactate, B. I.V. normal saline and potassium, C. ORS, D. I.V. Normal saline
B: I.V. normal saline and potassium
Answer: B: I.V. normal saline and potassium 
Explanation: Treatment of metabolic alkalosis due to vomiting or nasogastric suction.

Most children with metabolic alkalosis have one of the chloride responsive etiology (e.g., vomiting).
In these situations, administration of suffieeint sodium chloride and potassium chloride to correct volume deficit is necessary to correct metabolic alkalosis.
Adequate replacement of gastric losses of sodium and potassium in a child with vomiting can minimize or prevent the development of metabolic alkalosis.
With adequate intravascular volume and a normal serum potassium concentration, the kidney is able to excrete the excess bicarbonate within a couple of days.