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': 'Most common cause of hyperparathyroidism is \nSelect and explain. \nA. Di George syndrome, B. Following thyroid surgery, C. Mccune albright syndrome, D. Parathyroid hypoplasia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Most common cause of hypoparathyroidism is iatrogenic cause that is accidental removal of parathyroid glands during thyroidectomy.', 'role': 'assistant'}]