This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
[{'content': 'Pheochromocytoma predominantly secretes - \nSelect and explain. \nA. Epinephrine, B. Norepinephrine, C. Dopamine, D. DOPA', 'role': 'user'}, {'content': 'Answer: A \nExplanation: epinephrine is produced in much more amount that rest of the hormones ( Harrison 17 pg 2271)', 'role': 'assistant'}]