This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: M.I. & Angina, Subject name: Medicine
[{'content': 'What is diagnostic of fresh myocardial infarction in ECG: \nSelect and explain. \nA. QT interval prolongation, B. P mitrale, C. ST segment elevation, D. ST segment depression', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' ST segment elevation (Ref Harrison, 16/e, p 1450 (15/e, p1388), Schamroth 6/e, p40).", 'role': 'assistant'}]