This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breast, Subject name: Pathology
[{'content': 'Which of the following is not a seronegative spondyloardthropathy? \nSelect and explain. \nA. Psoriatic ahritis, B. ankylosing spondylitis, C. RA, D. Reiters ahritis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Seronegative spondyloahropathies (SpA) are a family of rheumatologic disorders that classically include: Ankylosing spondylitis (AS) Psoriatic ahritis (PsA) Inflammatory bowel disease (IBD) associated ahritis.Seronegative spondyloahropathies (seronegative spondyloahritides) share ceain clinical characteristics (eg, back pain, uveitis, GI symptoms, rashes). Some are strongly associated with the HLA-B27 allele. Rheumatoid factor (RF) is usually negative in the spondyloahropathies (hence, why they are called seronegative spondyloahropathies)', 'role': 'assistant'}]