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 factors do not result in increased risk of digitalis toxicity? 
Select and explain. 
A. Hypomagnesemia, B. Hypercalcemia, C. Hyperkalemia, D. Renal failure
C: Hyperkalemia
Answer: C: Hyperkalemia 
Explanation: Hyperkalemia