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 postoperative period is: \nSelect and explain. \nA. Bradycardia, B. Ventricular fibrillation, C. Tachycardia, D. Complete hea block', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Tachycardia Sinus tachycardia is most commonly occurring arrhythmia in the perioperative period.', 'role': 'assistant'}]