Rheumatoid factor in rheumatoid arthritis is important because -a) RA factor is associated with bad prognosisb) Absent RA factor rules out the diagnosis of Rheumatoid arthritisc) It is very common in childhood Rheumatoid arthritisd) It correlates with disease activity: (A) b, (B) ad, (C) ac, (D) ab
Answer is B. None