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: Medicine
[{'content': 'Surgical causes of hyper Ca2+: \nSelect and explain. \nA. Hyperparathyroidism, B. MEN, C. Hyperparathyroidism, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Answer is D (All of the above): Hypercalcemia may be associated with MEN type I and type II, Hyperparathyroidism and Hypehyroidism. Pheochromocytoma is also described as a rare cause of hypercalcemia and usually causes hypercalcemia in association with MEN syndrome.', 'role': 'assistant'}]