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
What is diagnostic of fresh myocardial infarction in ECG: 
Select and explain. 
A. QT interval prolongation, B. P mitrale, C. ST segment elevation, D. ST segment depression
C: ST segment elevation
Answer: C: ST segment elevation 
Explanation: Ans. is 'c' ST segment elevation (Ref Harrison, 16/e, p 1450 (15/e, p1388), Schamroth 6/e, p40).