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: Medicine
[{'content': 'Which one of the following is the drug of choice in the case of ventricular tachycardia in myocardial infarction ? \nSelect and explain. \nA. Xylocaine, B. Digitalis, C. Quinidine, D. Disopyramide', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]