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
Tachyphylaxis is seen after use of: 
Select and explain. 
A. Tamoxifen, B. Ephedrine, C. Morphine, D. Chlorpromazine
B: Ephedrine
Answer: B: Ephedrine 
Explanation: None