This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immune system, Subject name: Medicine
HLA B27 antigen is associated with all of the following disease except 
Select and explain. 
A. Ankylosing spondylitis, B. Reiter's syndrome, C. Psoriatic ahorpathy, D. Rheumatoid ahritis
D: Rheumatoid ahritis
Answer: D: Rheumatoid ahritis 
Explanation: REF:HARRISONS PRINCIPLE&;S OF INTERNAL MEDICINE 18TH EDITION