This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parathyroid and adrenal glands, Subject name: Surgery
[{'content': 'Most common cause for primary hyperparathyroidism is: \nSelect and explain. \nA. Single adenoma, B. Multiple adenomas, C. Single gland hyperplasia, D. Multiple gland hyperplasia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: - Solitary adenoma is the most common cause (80%) - Parathyroid adenomas are most commonly located in inferior parathyroid glands Primary Hyperparathyroidism (PHPT)- Caused by increased secretion of Parathyroid hormone (PTH) from abnormalparathyroid gland- More common in females- MC cause of PHPT - Solitary Adenoma (80% of cases)|MC location - Inferior parathyroid', 'role': 'assistant'}]