This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Acute coronary syndrome, Subject name: Medicine
A 45 year old man presents with central chest pain for 4 hours. Troponin I is 0.8ng/dl. Diagnosis is? 
Select and explain. 
A. Anterior wall, STEMI, B. Anterior wall, NSTEMI, C. Unstable Angina, D. Prinzmetal angina
B: Anterior wall, NSTEMI
Answer: B: Anterior wall, NSTEMI 
Explanation: The hea rate is 60/min with normal axis. Normal sinus rhythm is present. QRS complex duration is normal. T wave inversion is seen in V2-V4. Since cardiac biomarkers are elevated and ischemic changes are present in ECG, the diagnosis is anterior wall ischemia, NSTEMI.