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: Unknown
[{'content': 'Acute metabolic acidosis: (AI 2002) \nSelect and explain. \nA. Has biphasic effect on K+ excretion, B. Does not effect K + excretion, C. Decreases urinary K+ excretion, D. Increase urinary K+ excretion', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref: Harrison’s 18/e p366\n\xa0\n\nWhen H+ concentration is increased as in acidosis, H+ ions are secreted (preferentially over K+ ions) in exchange of Na+\nThus in acidosis K+ secretion into tubules (excretion) is inhibited', 'role': 'assistant'}]