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: Anaesthesia
[{'content': 'The most common rhythm disturbance during early post-operative period is – \nSelect and explain. \nA. Bradycardia, B. Ventricular fibrillation, C. Tachycardia, D. Complete heart block', 'role': 'user'}, {'content': 'Answer: C \nExplanation: "Sinus tachycardia is the most common arrhythmia in the perioperative period". \n─ Miller', 'role': 'assistant'}]