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: Forensic Medicine
[{'content': 'In holiday hea syndrome, most common feature seen is: Odisha 09; DNB 10 \nSelect and explain. \nA. Atrial fibrillation, B. Atrial flutter, C. Ventricular fibrillation, D. Ventricular flutter', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Atrial fibrillation', 'role': 'assistant'}]