This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and breast, Subject name: Anatomy
[{'content': 'Features to differentiate parathyroid adenoma from hyperplasia would include which of the following \nSelect and explain. \nA. Presence of excess chief cells, B. Infiltration of capsule, C. High levels of parathormone, 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 the case of adenoma, only one gland is found to be enlarged the other three are normal or atrophic. In hyperplasia, all four glands are diffusely enlarged. Some recent techniques such as 99mTc sestamibi scan are now able to localize and differentiate adenoma from hyperplasia, preoperatively.', 'role': 'assistant'}]