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
What is the diagnostic of fresh myocardial infraction 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: Ref Harrison 19 th ed pg 1594 addition to the clinical examination, three major noninvasive tools are used in the evaluation of NSTEMI-ACS: the electrocardiogram (ECG), cardiac biomarkers, and stress testing.