<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 28-year-old male comes to the physician for worsening back pain. The pain began 10 months ago, is worse in the morning, and improves with activity. He has also had bilateral hip pain and difficulty bending forward during exercise for the past 3 months. He has celiac disease and eats a gluten-free diet. Examination shows a limited range of spinal flexion. Flexion, abduction, and external rotation of both hips produces pain. Further evaluation of this patient is most likely to show which of the following laboratory findings?? A: Presence of anti-dsDNA antibodies, B: Presence of anti-Ro and anti-La antibodies, C: High levels of rheumatoid factor, D: HLA-B27 positive genotype, E: HLA-DR3-positive genotype,  <response>: This is a clinical vignette describing a 28-year-old male with chronic back pain that is worse in the morning and improves with activity, as well as bilateral hip pain and difficulty bending forward when exercising. He has a history of celiac disease. The examination shows limited spinal flexion and pain with hip movements. The key findings here are:- Young adult male - Chronic inflammatory back pain worse in morning and improving with activity - Bilateral hip pain - Limited spinal flexion on exam- Pain with hip movements on examThis presentation is most consistent with ankylosing spondylitis, a chronic inflammatory arthritis that typically presents in young adult males. It frequently involves the spine and sacroiliac joints, causing back pain and stiffness that is worse in the morning. Hip involvement is also common. The lab finding most associated with ankylosing spondylitis is HLA-B27 genotype. HLA-B27 is present in up to 90 of patients with ankylosing spondylitis. The other lab findings listed are not typically seen.Therefore, the correct answer is D.D: HLA-B27 positive genotype 