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': "Metyrosin is used in ? \nSelect and explain. \nA. Acromegaly, B. Cushing syndrome, C. Addison's disease, D. Pheochromocytoma", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans: D PheochromocytomaRef: KDT 7/e p. 128, 129; Katzung rlth/e p. g4lRate limiting step (tyrosine hydrorylation) in synthesis of epinephrine is inhibited by metyrosine.', 'role': 'assistant'}]