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: Pathology
Autoantibodies Ani Ro and Anti La are completely absent
in 
Select and explain. 
A. Systemic Lupus erythematosus, B. Sjogren's syndrome, C. Diffuse Scleroderma, D. Rheumatoid arthritis
D: Rheumatoid arthritis
Answer: D: Rheumatoid arthritis 
Explanation: Decreasing order of frequency of finding Anti - Ra (or SSa) & Anti- La (or SSb) antibodies is Sjogren's syndrome, SLE, Systemic sclerosis. SSa antibodies may be occasionally found but SSb antibodies may be totally absent in rheumatoid arthritis.