This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pancreas, Subject name: Surgery
[{'content': "Most common cause of hypercalcemia crisis is: \nSelect and explain. \nA. Parathyroid adenoma, B. Parathyroid hyperplasia, C. Carcinoma breast, D. Paget's disease", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Carcinoma breastRef: Harrison 18/e p 3106* MC cause of Hypercalcemia - Parathyroid adenoma* MC cause of Hypercalcemic Crisis - Malignancy (Cancer Breast is the MC cause)', 'role': 'assistant'}]