This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pancreas, Subject name: Surgery
Which of the following is the least sensitive in preoperative imaging of parathyroid in Primary hyperparathyroidism? 
Select and explain. 
A. Sestamibi, B. Sestamibi SPECT, C. MRI, D. USG
C: MRI
Answer: C: MRI 
Explanation: Ans. (c) MRIRef. SABISTON 20th Edition Page 930ImagingSensitivitySpecificitySafetyTc99 SestamibiModerateModerateSafeSestamibiSPECTHighHighSafeUltrasoundModerateModerateSafe4D CTHighHighRadiationMRILowModerateSafePET/CTHighHighRadiationVenous localizationHighHighNephropathy site specific injuryUSG guided biopsyHighHighSite specific injury