This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': 'Norepinephrine is produced by \nSelect and explain. \nA. Zona fasiculata, B. Zona glomerulosa, C. Zona reticularis, D. Adrenal medulla', 'role': 'user'}, {'content': 'Answer: D \nExplanation: (D) Adrenal medulla # Adrenal Cortex> The adrenal cortex synthesizes three different types of steroids:> Glucocorticoids (principally cortisol), which are synthesized primarily in the zona fasciculata with a small contribution from the zona reticularis.> Mineralocorticoids, the most important being aldosterone, which is generated in the zona glomerulosa.> Sex steroids (estrogens and androgens), which are produced largely in the zona reticularis.> The adrenal medulla is composed of chromaffin cells, which synthesize and secrete catecholamines, mainly epinephrine.\\> Catecholamines have many effects that allow rapid adaptations to changes in the environment.> Norepinephrine, epinephrine, and dopamine are secreted by the adrenal medulla.', 'role': 'assistant'}]