This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hypeension, Arrhythmias, Dyslipidemia, Subject name: Pharmacology
[{'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: Lidocaine* It is used to suppress VT and prevent VF.* It is ineffective in atrial arrhythmias. DOC for Digitalis induced ventricular extrasystoles', 'role': 'assistant'}]