This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
[{'content': 'A drug used for ventricular arrhythmias caused by digoxin? \nSelect and explain. \nA. Verapamil, B. Diltiazem, C. quinidine, D. Phenytoin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ventricular arrhythmias caused by digoxin are best treated with lidocaine, followed by phenytoin-class 1 antiarhhmatics REF Essentials of Medical Pharmacology KD Tripathi 8th ed.', 'role': 'assistant'}]