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
The following phenomenon is shown by which of the following drug? 
Select and explain. 
A. Epinephrine, B. Ephedrine, C. Dopamine, D. Isoprenaline
B: Ephedrine
Answer: B: Ephedrine 
Explanation: The phenomenon is tachyphylaxis which is shown by ephedrine, tyramine.