This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S., Subject name: Medicine
[{'content': 'This patient had hypertension. What is the diagnosis? \nSelect and explain. \nA. Coarctation of the aorta, B. Pheochromocytoma, C. Primary hyperaldosteronism, D. Renal artery stenosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer B. PheochromocytomaThere is a heterogeneous (vascular), contrast-enhanced, right adrenal mass, 4.5 cm in diameter. This is most consistent with a pheochromocytoma.', 'role': 'assistant'}]