This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: ECG and Arrhythmias 1, Subject name: Medicine
[{'content': 'Comment on the diagnosis \nSelect and explain. \nA. Prinzmetal angina, B. Myocardial infarction, C. Pulmonary embolism, D. Hyperkalemia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: ECG shows hea rate of 70/min with T wave inversion noted in leads V1 to V4. Indicates possible Myocardial ischemia. Choice A and D are ruled out as there is no ST elevation. Pulmonary embolism leads to "S1Q3T3 pattern" (McGinn-White Sign)', 'role': 'assistant'}]