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
Comment on the diagnosis 
Select and explain. 
A. Prinzmetal angina, B. Myocardial infarction, C. Pulmonary embolism, D. Hyperkalemia
B: Myocardial infarction
Answer: B: Myocardial infarction 
Explanation: 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)