General Medicine General e90650a7 Which of the following best represents the impoance of Rheumatoid factor in rheumatoid ahritis? A Rheumatoid factor is associated with bad prognosis B Rheumatoid factor correlates with disease activity C Rheumatoid factor is very common in childhood Rheumatoid ahritis D Absent rheumatoid factor rules out the diagnosis of Rheumatoid ahritis