This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
Which test is performed to detect reversible myocardial ischemia 
Select and explain. 
A. Coronary angiography, B. MUGAscan, C. Thallium scan, D. Resting echocardiography
C: Thallium scan
Answer: C: Thallium scan 
Explanation: thallium scan is the test which is performed to detect myocardial ischemia