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: Pathology
[{'content': 'Most common cause of primary hyperpara-thyroidism - \nSelect and explain. \nA. Hyperplasia, B. Solitary Adenoma, C. Carcinoma, D. Multiple adenomas', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer- B. Solitary AdenomaParathyroid adenoma (85% to 95%)', 'role': 'assistant'}]