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
[{'content': 'Increased frequency of HLA-B  27 is seen in all the following diseases except - \nSelect and explain. \nA. Ankylosing spondylitis, B. Reiters syndrome, C. Acute anterior uveitis, D. Myasthenia gravis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]