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
All of the following are true of atrial fibrillation EXCEPT 
Select and explain. 
A. Occurs in rheumatic mitral stenosis, B. May cause thromboembolic complications, C. Pulse is irregularly irregular, D. Associated with sinus bradycardia
D: Associated with sinus bradycardia
Answer: D: Associated with sinus bradycardia 
Explanation: None