This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluid and electrolytes, Subject name: Medicine
[{'content': 'Metabolic alkalosis is seen in- \nSelect and explain. \nA. Primary mineralocoicoid excess, B. Deficiency of mineralocoicoid, C. Decreased acid excretion, D. Decreased base excretion', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Mineralocoicoid excess increases net acid excretion and may result in metabolic alkalosis, which may be worsened by associated K+ deficiency. ECFV expansion from salt retention causes hypeension. The kaliuresis persists because of mineralocoicoid excess and distal Na+ absorption causing enhanced K+ excretion, continued K+ depletion with polydipsia, inability to concentrate the urine, and polyuria.', 'role': 'assistant'}]