This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Adrenal, Subject name: Medicine
[{'content': 'Increased VMA is seen in? \nSelect and explain. \nA. Pheochromocytoma, B. Tyrosinemia, C. Parkinsonism, D. Phenylketonuria', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. (a) PheochromocytomaRef: Harrison's 18th ed. ch.: 343", 'role': 'assistant'}]