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
[{'content': 'In radionuclide imaging, the most useful radiopharmaceutical agent for skeletal imaging is: March 2012 \nSelect and explain. \nA. Tc-99m linked to methylene diphosphonate (99m Tc-MDP), B. Tc-99 pyrophosphate, C. Tc-sulphur colloid (99m Tc-Sc), D. Gallium 67', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans: A i.e. Tc-99m linked to methylene diphosphonate (99m Tc-MDP) Radiopharmacological agents and uses Tc-99m linked to methylene diphosphonate (99m Tc-MDP) is used in bone imaging Tc-99 pyrophosphate is used for defining hot spots in myocardial infarction/avid infarct imaging 99m Tc-Sc is used in imaging of reticuloendothelial system (liver/ spleen), gastric emptying, GI bleeds Gallium 67 is used for tumours/abscess', 'role': 'assistant'}]