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: Medicine
Which of the following tests is used to detect reversible myocardial ischemia 
Select and explain. 
A. Angiography, B. Thallium scan, C. MUGA, D. Resting Echocardiography
B: Thallium scan
Answer: B: Thallium scan 
Explanation: Answer is B (Thallium scan) Reversible Myocardial Ischemia can be detected by myocardial perfusion imaging using compounds labeled with thallium- 201 (Thallium Scan) What is Reversible Myocardial Ischemia: Role of Thallium scanning Reversible myocardial ischemia refers to areas of myocardium that become ischemic on stress /exercise, but region bility / circulation on resting and do not progress to infarction Such areas of myocardium can be detected by myocardial perfusion imaging using the Thallium scan. Thallium scan can thus help in distinguishing between on ischemic area (reversible) and an infracted / scarred area of myocardium (irreversible)