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: Pharmacology
[{'content': "Best treatment of severe' digitalis toxicity is: \nSelect and explain. \nA. Potassium supplements, B. Diphenyl hydantoin, C. Quinidine, D. Fab fragments of digitalis antibodies", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]