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': 'Which of the following factors do not result in increased risk of digitalis toxicity? \nSelect and explain. \nA. Hypomagnesemia, B. Hypercalcemia, C. Hyperkalemia, D. Renal failure', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Hyperkalemia', 'role': 'assistant'}]