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
[{'content': 'Which is not an endogenous catecholamine? \nSelect and explain. \nA. Isoprenaline, B. Dopamine, C. Noradrenaline, D. Adrenaline', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. Isoprenalinea. Dopamine, adrenaline and noradrenaline are endogenous catecholamines,b. Dobutamine, fenoldopam, dopexamine and isoprenaline are exogenous catecholamines', 'role': 'assistant'}]