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 is not an endogenous catecholamine ? 
Select and explain. 
A. Dopamine, B. Dobutamine, C. Adrenaline, D. Noradrenaline
B: Dobutamine
Answer: B: Dobutamine 
Explanation: None