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
Best treatment of severe' digitalis toxicity is: 
Select and explain. 
A. Potassium supplements, B. Diphenyl hydantoin, C. Quinidine, D. Fab fragments of digitalis antibodies
D: Fab fragments of digitalis antibodies
Answer: D: Fab fragments of digitalis antibodies 
Explanation: None