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
Technitium 99 is most commonly used in 
Select and explain. 
A. Cardiology, B. Radiotherapy, C. Radiodiagnosis, D. Nuclear medicine
D: Nuclear medicine
Answer: D: Nuclear medicine 
Explanation: RADIO NUCLIDE IMAGING 99Tc is the most commonly used radiopharmaceutical, for imaging in nuclear medicine.