This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Anatomy
[{'content': 'Lignocaine is useful for the treatment of : \nSelect and explain. \nA. Atrial fibrillation, B. Paroxysmal supraventricular tachycardia, C. Digitalis induced ventricular extrasystoles, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: (Ref: KDT 6/e p502) Lignocaine is used only for the treatment of ventricular arrhythmias, it has no role in atrial arrhythmia.', 'role': 'assistant'}]