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': 'Not true about rheumatoid arthritis \nSelect and explain. \nA. Peri-articular osteopenia, B. Periosteal reaction seen, C. Narrowing of joint space, D. DIP is usually spared', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]