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': 'Digoxin toxicity is aggrevated by \nSelect and explain. \nA. Hypokalemia, B. Hyperkalemia, C. Hypermagnesimaia, D. Hypocalcemia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Hypokalemia is usually observed with chronic toxicity or in patients taking diuretics; it reduces the rate of Na+/K+ ATPase pump turnover and exacerbates pump inhibition due to digitalis. Hyperkalemia is the usual electrolyte abnormality precipitated by digoxin toxicity, primarily in the acute setting Refer kDT 6/e p499', 'role': 'assistant'}]