This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S., Subject name: Medicine
[{'content': 'Paroxysmal AV block is associated with: \nSelect and explain. \nA. First degree block, B. Type I second degree block, C. Type II second degree block, D. Third degree block', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. Type II second degree block* Paroxysmal AV block are series of non-conducted P waves associated with Second-degree AV block (particularly type II).* It implies significant conduction system disease and is an indication for permanent pacing.ECG shows multiple non-conducted P waves after a period of sinus bradycardia with a normal PR interval.', 'role': 'assistant'}]