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': 'Features to differentiate parathyroid adenoma from hyperplasia would include which of the following? \nSelect and explain. \nA. Presence of excess chief cells, B. High levels of parathormone, C. Infiltration of capsule, D. Identifying hyperplasia of all 4 glands at surgery in parathyroid hyperplasia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Parathyroid adenoma can be differentiated from hyperplasia only at the time of surgery In case of adenoma, only one gland is found to be enlarged, the other three are normal. In hyperplasia, all four glands are enlarged.', 'role': 'assistant'}]