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': 'Sustained diarrhea can lead to: \nSelect and explain. \nA. Metabolic acidosis, B. Metabolic alkalosis, C. Respiratory alkalosis, D. Respiratory acidosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]