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
Sensitive investigation to detect ectopic parathyroid 
Select and explain. 
A. CECT neck, B. MRI, C. Sestamibi scan, D. Thallium scan
C: Sestamibi scan
Answer: C: Sestamibi scan 
Explanation: Sestamibi scan is very sensitive to detect parathyroid adenoma and ectopic parathyroid.