This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
[{'content': 'True about tachyphylaxis is: \nSelect and explain. \nA. Direct sympathomimetics involved, B. Mechanism clearly understood, C. Ephedrine tachyphylaxis reversed with dopamine, D. Indirect sympathomimetics involved', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Tachyphylaxis refers to rapid development of tolerance when doses of a drug repeated in quick succession result in marked reduction in response . This is usually seen with indirectly acting drugs , such as ephedrine , Tyramine , nicotine. From medical pharmacology padmaja 4th edition page no 70', 'role': 'assistant'}]