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: Radiology
[{'content': 'Sensitive investigation to detect ectopic parathyroid \nSelect and explain. \nA. CECT neck, B. MRI, C. Sestamibi scan, D. Thallium scan', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Sestamibi scan is very sensitive to detect parathyroid adenoma and ectopic parathyroid.', 'role': 'assistant'}]