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
Which technetium is most commonly used in bone pathology? 
Select and explain. 
A. 99m Tc MDP, B. 99mTc Sestamibi, C. 99m Tc Exametazime, D. 99m Tc Pyrophosphate
A: 99m Tc MDP
Answer: A: 99m Tc MDP 
Explanation: Technetium (99mTc) medronic acid is a pharmaceutical product used in nuclear medicine to localize hone metastases as well as other diseases that can alter the normal osteogenesis in bone. 99mTc-medronate

Aka 99mTc-methylene diphosphonate, or 99mTc-MDP
FDA approved imaging agent to investigate extra-skeletal osteogenesis (Metastasis)