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 of the following ECG findings is associated with acute myocardial infraction \nSelect and explain. \nA. Elevation of S wave, B. Prolonged QT interval, C. Tall T waves with increased amplitude, D. Prolonged PR interval', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref Harrison 19 th ed pg 1594 ST-segment depression occurs in 20 to 25% of patients; it may be transient in patients without biomarker evidence of myocardial necrosis, but may be persistent for several days in NSTEMI. T-wave changes are common but are less specific signs of ischemia, unless they are new and deep T-wave inversions (>=0.3 mV).', 'role': 'assistant'}]