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: Medicine
[{'content': 'True statement regarding Atrioventricular block with atrial tachycardia is : \nSelect and explain. \nA. Seen in WPW syndrome, B. Is a complication of pacemaker, C. Can occur in normal person occasionally, D. Seen in Digitalis toxicity with K+ depletion', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Answer is D (Seen in digitalis toxicity with K+ depletion) Nonparoxysmal atrial tachycardia with variable AV block is characteristic of digitalis intoxication. - Depletion of potassium stores is one of the most common precipitating cause of digitalis intoxication. Presence of potassium depletion in association with digitalis is thus likely to result in manifestations of digitalis toxicity.', 'role': 'assistant'}]