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
Which of the following is a non–catecholamine sympathomimetic drug? 
Select and explain. 
A. Ephedrine, B. Dopamine, C. Isoproterenol, D. Dobutamine
A: Ephedrine
Answer: A: Ephedrine 
Explanation: None