This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunity, Subject name: Pathology
ANA (antinuclear antibody) is seen in all except: 
Select and explain. 
A. SLE, B. RA, C. Sjogren's syndrome, D. Systemic sclerosis
B: RA
Answer: B: RA 
Explanation: Ans. (b) RA(Ref: Harrison 18th/chapter 321, 323)Antibodies seen in RA are rheumatoid factors (RFs) and anti-cyclic citrullinated peptides (CCP) antibodies ANA is seen in:Almost all (>95%) cases of SLEIn virtually all patients with SSc (Systemic sclerosis)50% to 80% cases of Sjogren syndrome