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
Increased frequency of HLA-B  27 is seen in all the following diseases except - 
Select and explain. 
A. Ankylosing spondylitis, B. Reiters syndrome, C. Acute anterior uveitis, D. Myasthenia gravis
D: Myasthenia gravis
Answer: D: Myasthenia gravis 
Explanation: None