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': 'Which of the following drugs is best for reducing proteinuria in a diabetic patient ? \nSelect and explain. \nA. Metoprolol, B. Perindopril, C. Chlorothiazide, D. Clonidine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]