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
[{'content': 'All of the following catecholamines are secreted endogenously, EXCEPT: \nSelect and explain. \nA. Epinephrine, B. Norepinephrine, C. Dopamine, D. Dobutamine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The medulla of adrenal gland is extremely vascular and consists of large chromophil cells arranged in a network. It is made of 2 cell types called pheochromocytes--epinephrine-producing (more numerous) and norepinephrine-producing cells. These cells synthesize and secrete the catecholamines - epinephrine (in greater amounts), norepinephrine and, to a lesser extent, dopamine. Ref: Molina P.E. (2010). Chapter 6. Adrenal Gland. In P.E. Molina (Ed), Endocrine Physiology, 3e.', 'role': 'assistant'}]