This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parathyroid, Subject name: Medicine
[{'content': 'Investigation of choice in parathyroid pathology is - \nSelect and explain. \nA. CT scan, B. Gallium scan, C. Thallium scan, D. Technetium-99 sestamibi scan', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Technetium-99 sestamibi scan Localization studieso The diagnosis of primary hyperparathyroidism is established by appropriate biochemical testing.# Localization studies with ultrasonography, technetium-99m sestamibi, CT, or MRI scanning should not be used to establish the diagnosis of primary hyperparathyroidism.# Their utility is questionable when bilateral neck exploration is planned.# However, they are commonly used now. along with intraoperative PTH monitoring, to facilitate unilateral exploration and minimally invasive surgery in those with probable single gland disease.", 'role': 'assistant'}]