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 drug decreases plasma renin activity? \nSelect and explain. \nA. Enalapril, B. Nefidipine, C. Hydralazine, D. Clonidine', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Clonidine o Drugs which increase plasma renin activity (Diuretics, vasodilators, CCBs, ACE inhibitors) may be combined with drugs which lower plasma renin activity (sympatholytic drugs - b-blockers, clonidine, methyl dopa).", 'role': 'assistant'}]