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
[{'content': 'Metabolic alkalosis is seen in - \nSelect and explain. \nA. Primary mineralocorticoid excess, B. Deficiency of mineralocorticoid, C. Decreased acid excretion, D. Decreased base excretion', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]