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': 'Increased Ca, decreased PO4. Diagnosi- \nSelect and explain. \nA. Primary hyperparathyroidism, B. Secondary hyperparathyroidism due to Vit D deficiency, C. Malignancy, D. Osteoporosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]