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: Unknown
[{'content': 'A 56-year-old woman presents with word-finding difficulty and hand weakness for 1 hour. ECG was done to find cause of TIA. ECG shows? \nSelect and explain. \nA. Atrial fibrillation, B. Atrial flutter, C. Paroxysmal atrial tachycardia, D. Multi-focal atrial tachycardia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Atrial fibrillation.The rhythm is irregularly irregular at a rate of approximately 90 beats/ min. There is no clear atrial activity; thus, the diagnosis is atrial fibrillation. Other findings include a normal axis, normal intervals, no evidence of chamber enlargement or hypertrophy, and non-specific ST-T wave abnormalities (inversions and flattening) in leads V1 and V2.', 'role': 'assistant'}]