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
Which of the following causes metabolic acidoosis? 
Select and explain. 
A. Mineralocoicoid deficiency, B. Bater's syndrome, C. Thiazide diuretic therapy, D. Recurrent vomiting
A: Mineralocoicoid deficiency
Answer: A: Mineralocoicoid deficiency 
Explanation: Bater's syndrome, thiazide diuretic therapy and recurrent vomiting results in metabolic alkalois. Mineralocoicoid deficiency results in metabolic acidosis. Ref: Harrisons principles of internal medicine, 18th edition, Page: 369.