This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disease of pericardium, Subject name: Medicine
A 46 year old man presents with diffuse chest pain at rest and recent history of cough, fever and rhinorrhea lasting for 3 days. ECG shows? 
Select and explain. 
A. Acute pericarditis, B. Constrictive pericarditis, C. Takotsubo cardiomyopathy, D. Cor-pulmonale
A: Acute pericarditis
Answer: A: Acute pericarditis 
Explanation: Sinus rhythm at approx. 75 beats/min. PR interval is prolonged to 200 msec. The QRS axis and intervals are normal. ST elevations with concave upward morphology are seen in I and aVL, II and aVF, and V2 through V6. The upward concavity of the ST segment, the PR-segment depression, the lack of Q waves, and the diffuse nature of the ST-segment elevation in more than one coronary aery distribution make pericarditis the likely etiology. Patients with pericarditis will complain of chest pain, typically described as sharp and pleuritic. Radiation of the pain is towards trapezius ridge. The pain is improved with sitting up and leaning forward and worsened by leaning backward.