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: Medicine
[{'content': 'Increased Ca, decreased PO4. Diagnosis : - \nSelect and explain. \nA. Primary hyperparathyroidism, B. Secondary hypoparathyroidism due to Vit D deficiency, C. Malignancy, D. Osteoporosis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Primary hyperparathyroidism o Repeat from previous session.", 'role': 'assistant'}]