This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Radiotherapy Pa 1, Subject name: Radiology
Radioisotope study preferred for detection of parathyroid adenoma is? 
Select and explain. 
A. I-131, B. Sestamibi scan, C. Thallium-201 scan, D. Tc 99m-MDP
B: Sestamibi scan
Answer: B: Sestamibi scan 
Explanation: Sestamibi Scan Is preferred isotope study used for Parathyroid Adenoma I-131 is used for Systemic Radiotherapy of Thyroid Cancers Thallium-201 scan is used for Myocardial Perfusion Tc99m-MDP/Medronate is used for Bone scan