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
Isotope used in myocardial perfusion scan is – a) Technetiumb) Thalliumc) Stannous pyrophosphated) Gallium 
Select and explain. 
A. ab, B. a, C. ad, D. bc
A: ab
Answer: A: ab 
Explanation: Perfusion Scan   → Thallium (mc), technetium, MIBI.
Infarct Scan       →  Technetium pyrophosphate.