This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Rheumatoid Arthritis, Subject name: Orthopaedics
[{'content': 'All are the features of rheumatoid arthrtitis except- \nSelect and explain. \nA. Osteosclerosis of joint, B. Soft tissue swelling, C. Narrowing of joint space, D. Periarticular osteoporosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is "a\' i.e., Osteosclerosis of joint Radiological features of RAo Following features are seen on X-ray :-Reduced j oint spaceErosion of articular marginsSubchondral cystsJuxta-articular rarefactionSoft tissue shadowr at the level of the joint because of joint effusion or synovial hypertrophyDeformities of the hand and fingersPeriarticular osteopenia (osteoporosis)', 'role': 'assistant'}]