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
Most common cause of hypercalcemia crisis is: 
Select and explain. 
A. Parathyroid adenoma, B. Parathyroid hyperplasia, C. Carcinoma breast, D. Paget's disease
C: Carcinoma breast
Answer: C: Carcinoma breast 
Explanation: 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)