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': 'All are TRUE about hyperparathyroidism, except- \nSelect and explain. \nA. Commonly occurs after thyroidectomy, B. May cause hypercalcemia, C. Solitary adenoma is the most common cause, D. None of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: solitary adenoma is the most common cause ( Harrison 17 pg 2380)', 'role': 'assistant'}]