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': 'All of the following are seen in digitals toxicity except \nSelect and explain. \nA. Ventricular bigeminy, B. Paroxysmal arial tachycardia with fast ventricular rate, C. Regularization of atrial fibrillation, D. Bidirectional ventricular tachycardia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref-critical care toxicology 4/e p395 Digital characteristics cause atrial tachycardia with AV block, it does not cause at atrial tachycardia with fast Venturicular rate', 'role': 'assistant'}]