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
Most common cause of primary hyperpara-thyroidism - 
Select and explain. 
A. Hyperplasia, B. Solitary Adenoma, C. Carcinoma, D. Multiple adenomas
B: Solitary Adenoma
Answer: B: Solitary Adenoma 
Explanation: Answer- B. Solitary AdenomaParathyroid adenoma (85% to 95%)