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: Pharmacology
[{'content': 'If a diabetic patient being treated with an oral hypoglycemic agent develops dilutional hyponatremia, which one of the following could be responsible for this effect? \nSelect and explain. \nA. Chlorpropamide, B. Tolbutamide, C. Glyburide, D. Glimepiride', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]