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
[{'content': 'Which test is performed to detect reversible myocardial ischemia \nSelect and explain. \nA. Coronary angiography, B. MUGAscan, C. Thallium scan, D. Resting echocardiography', 'role': 'user'}, {'content': 'Answer: C \nExplanation: thallium scan is the test which is performed to detect myocardial ischemia', 'role': 'assistant'}]