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 does not cause bradycardia \nSelect and explain. \nA. Propranolol, B. Hydralazine, C. Clonidine, D. Reserpine', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Hydralazine o Hydralazine causes reflex tachycardia. o Propranolol, clonidine and reserpine are sympatholytic drugs cause bradycardia.", 'role': 'assistant'}]