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
Surgical causes of hyper Ca2+: 
Select and explain. 
A. Hyperparathyroidism, B. MEN, C. Hyperparathyroidism, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: 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.