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
HLA 27 antigen is associated with all of the following disease except - 
Select and explain. 
A. Ankylosing spondylitis, B. Reiter's syndrome, C. Psoriatic arthorpathy, D. Rheumatoid arthritis
D: Rheumatoid arthritis
Answer: D: Rheumatoid arthritis 
Explanation: None