This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
[{'content': 'Digoxon is not affected in: \nSelect and explain. \nA. Hepatic disease, B. Electrolyte disturbances, C. Renal failure, D. MI', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref:KDT 5/e p463; KDT 6/e p497 Digoxin has also been associated with visual disturbance (blurred or yellow vision), abdominal pain, and breast enlargement. Patients with low blood potassium levels can developdigoxin toxicity even when digoxinlevels are not considered elevated.', 'role': 'assistant'}]