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: Pharmacology
[{'content': 'An agent of choice in acute hypercalcemia due to malignancy is \nSelect and explain. \nA. Calcitonin, B. Cholecalciferol, C. Teriperatide, D. Zolendronate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Calcitonin is the fastest acting followed by I.V bisphosphonates. hyperccalcimia in malignancy is mainly seen in tumors secreting Parathyroid hormone related peptide PTHrP. Ref: CMDT pg 801 2010 ed.', 'role': 'assistant'}]