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': 'Nitroglycerin caused all accept: \nSelect and explain. \nA. Methemoglobinemia., B. Bradycardia., C. Tachycardia., D. Vasodilation.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Nitrates cause vasodilation, resulting in hypotension which leads to reflex tachycardia.', 'role': 'assistant'}]