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': 'Surinder singh developed acute CHF and was puton digitalis therpy. ECG of this patient revealed the presence of ventricular extrasystoles. Which of the following drugs can be administered safely to this patient in order to counteract this arrhythmia? \nSelect and explain. \nA. Lignocaine, B. Quinidine, C. Atropine, D. Amiodarone', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (Ref: KDT 6/e p498) Lignocaine is the drug of choice for ventricular arrhythmias due to digitalis toxicity.', 'role': 'assistant'}]