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': 'Digoxin toxicity is aggravated by: a) Hypokalemia b) Hyperkalernia c) Hypercalcemia d) Hypermagnesemia e) Hypocalcemia \nSelect and explain. \nA. ad, B. bc, C. cd, D. ac', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]