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': 'Isotope used in myocardial perfusion scan is – a) Technetiumb) Thalliumc) Stannous pyrophosphated) Gallium \nSelect and explain. \nA. ab, B. a, C. ad, D. bc', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Perfusion Scan\xa0\xa0\xa0→\xa0Thallium (mc), technetium, MIBI.\nInfarct Scan \xa0 \xa0 \xa0\xa0→\xa0\xa0Technetium pyrophosphate.', 'role': 'assistant'}]