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
Which is NOT characterized by bony lesion - 
Select and explain. 
A. Gout, B. SLE, C. Psoriasis, D. Rheumatoid arthritis
B: SLE
Answer: B: SLE 
Explanation: SLE does not cause bone erosion (erosive arthritis). Other three options cause erosive arthritis (bone erosion).