This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Adrenergic System, Subject name: Pharmacology
Which is not an endogenous catecholamine? 
Select and explain. 
A. Isoprenaline, B. Dopamine, C. Noradrenaline, D. Adrenaline
A: Isoprenaline
Answer: A: Isoprenaline 
Explanation: Ans. A. Isoprenalinea. Dopamine, adrenaline and noradrenaline are endogenous catecholamines,b. Dobutamine, fenoldopam, dopexamine and isoprenaline are exogenous catecholamines