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': "A young patient presented with HTN and VMA 14 mg/24, the causes is/are - \nSelect and explain. \nA. Medullary carcinoma thyroid, B. VonHippelLindau syndrome, C. Grave's disease, D. Pseudohypoparathyroidism", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answers are options 1and 2 i.e. Medullary Ca of thyroid and Von Hippel Lindau syndrome Familial syndrome associated with pheochromocytoma are MEN type 2A MEN type 2B Von Hippel Lindau disease Von Reclinghausen&;s neurofibromatosis Sturge weber syndrome Ref Harrison 17/e p2358', 'role': 'assistant'}]