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: Orthopaedics
[{'content': 'True statements about ankylosing spondylitis include all except -a) HLA-B27 is found in 90% of sufferersb) Uveitis is found in 15 to 20% of sufferersc) The conditions is commoner in femaled) The radiological changes can occur in the spine before symptoms \nSelect and explain. \nA. bcd, B. acd, C. ac, D. bd', 'role': 'user'}, {'content': 'Answer: A \nExplanation: HLA - B27 is positive in 90-95% of cases.\nUveitis occurs in 40% of patients (Harrison 17th /e 2111)\nAnkylosing spondylitis is more common in males.\nRadiological changes do not occur before clinical symptoms :-\n\n"One of the drawback to radiography is that the disease may be present for 7-10 years before changes are\xa0significance enough to be visualized with conventional X-rays. Thus patients presenting with early - stage ankylosing\xa0spondylitis will most likely have a negative X-ray". — Medifocus Guidebook on ankylosing spondylitis', 'role': 'assistant'}]