This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardio thoracic surgery  , Subject name: Surgery
Maze operation is done in which of the following condition 
Select and explain. 
A. Atrial fibrillation, B. Complete hea block, C. Ebstein anomaly, D. Truncus aeriosus
A: Atrial fibrillation
Answer: A: Atrial fibrillation 
Explanation: Surgical ablation of AF is typically performed at the time of other cardiac valve or coronary aery surgery and, less commonly, as a stand-alone procedure. The Cox surgical Maze procedure is designed to interrupt all macroreentrant circuits that might potentially develop in the atria, thereby precluding the ability of the atria to fibrillate.