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': 'All of the following agents may be used in the management of chronic hypocalcemia, except- \nSelect and explain. \nA. Etidronate, B. Thiazides, C. Elemental Calcium, D. Vatamin D analogs', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]