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
Aortic regurgitation may be associated with all of the following except - 
Select and explain. 
A. Ankylosing Spondylitis, B. Marfan's Syndrome, C. Dissection of the aorta, D. Polyarteritis nodosa
D: Polyarteritis nodosa
Answer: D: Polyarteritis nodosa 
Explanation: None