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 a radiological feature of osteoarthritis \nSelect and explain. \nA. Osteophytes, B. Subchondral bone is translucent, C. Narrowing of joint space, D. Cystic lesions close to articular surface.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]