This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, 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: Answer is C (ST segment elevation)