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
Which of the following is a monovalent cation that can reverse a digitalis induced arrhythmia ? 
Select and explain. 
A. Digibind antibodies, B. Lignocaine, C. Magnesium, D. Potassium
D: Potassium
Answer: D: Potassium 
Explanation: None