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: Surgery
[{'content': 'Which radiological feature would help differentiate rheumatoid ahritis with SLE? \nSelect and explain. \nA. Erosion, B. Juxta-aicular osteoporosis, C. Subluxation of MCP joint, D. Swelling of PIP joint', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer is A (Erosion): SLE is characterized by non erosive ahritis while bone erosions are characteristic in Rheumatoid Ahritis.', 'role': 'assistant'}]