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: Medicine
Causes of metabolic alkalosis include all the following except - 
Select and explain. 
A. Mineralocorticoid deficiency, B. Bartter's syndrome, C. Thiazide diuretic therapy, D. Recurrent vomiting
A: Mineralocorticoid deficiency
Answer: A: Mineralocorticoid deficiency 
Explanation: Mineralo corticoid deficiency is a cause normal anion gap metabolic acidosis-
Recurrent vomiting

Gastro intestinal loss of H+ from repeated vomitings results in retention of HCO3- and hence metabolic alkalosis

Thiazides

Thiazides are diuretics which acutely diminish the ECF volume without altering the total body bicarbonate
The serum Bicarbonate concentration, therefore, increases and hence metabolic alkalosis

Bartter's Syndrome

Bartter's syndrome is characterized pathologically by impaired Cl- reabsorption in the thick ascending loop of Henle and clinically by a triad of
Metabolic alkalosis
Hypokalemia
Normal or low B.P.