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
[{'content': 'Most common arrhythmia after reperfusion syndrome is \nSelect and explain. \nA. AIVR, B. VT, C. Ventricular fibrillation, D. PSVT', 'role': 'user'}, {'content': 'Answer: A \nExplanation: AIVR is currently defined as an enhanced ectopic ventricular rhythm with at least 3 consecutive ventricular beats, which is faster than normal intrinsic ventricular escape rhythm (<=40 bpm), but slower than ventricular tachycardia (at least 100-120 bpm) Ref Harrison 20th edition pg 1432', 'role': 'assistant'}]