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: Surgery
[{'content': 'Which is the MOST common surgically repairable cause of hyperparathyroidism? \nSelect and explain. \nA. Adenoma, B. Carcinoma, C. Hyperplasia, D. Renal disease', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Primary hyperparathyroidism is a surgical disease and operation is required for the hyperfunctioning gland. A single hyperfunctioning adenoma accounts for approximately 80% cases. Multiple adenoma or hyperplasia account for 15-20% and parathyroid carcinoma account for 1% cases of hyperparathyroidism.', 'role': 'assistant'}]