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
Metabolic alkalosis is seen in - 
Select and explain. 
A. Primary mineralocorticoid excess, B. Deficiency of mineralocorticoid, C. Decreased acid excretion, D. Decreased base excretion
A: Primary mineralocorticoid excess
Answer: A: Primary mineralocorticoid excess 
Explanation: None