This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immune system, Subject name: Medicine
[{'content': 'A middle aged female presents with polyahritis with elevated rheumatoid factor ANA analevels, which among the following will help you to differentiate rheumatoid ahritis from SLE? \nSelect and explain. \nA. Soft tissue swelling at the proximal inter phalangial joint, B. Juxta aicular osteoporosis or X-ray, C. Aicular erosions on X-ray, D. Elevated ESR', 'role': 'user'}, {'content': "Answer: C \nExplanation: Joint erosions is not a feature of SLE . It is only seen in some conditions such as Rheumatoid ahritis Gout Psoriatic ahritis Reiter's disease Erosive OA Hemophilia IBD Ankylosing spondolytis Ref - pubmed.com", 'role': 'assistant'}]