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
Not a x-ray feature of rheumatoid arthritis 
Select and explain. 
A. Subchondral cysts, B. Subchondral osteopenia, C. Subchondral swelling, D. Osteophytes
D: Osteophytes
Answer: D: Osteophytes 
Explanation: None