This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'The following phenomenon is shown by which of the following drug? \nSelect and explain. \nA. Epinephrine, B. Ephedrine, C. Dopamine, D. Isoprenaline', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The phenomenon is tachyphylaxis which is shown by ephedrine, tyramine.', 'role': 'assistant'}]