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: Medicine
[{'content': 'All of the following statements regarding Rheumatoid ahritis are true, except? \nSelect and explain. \nA. IgM antibody directed against Fc pa of IgG, B. Morning stiffness, C. Raised ESR, D. C - Reactive protein suggests a good prognosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: High ESR and CRP are associated with poor prognosis in rheumatoid ahritis. Rheumatoid factor (IgM antibody directed against Fc poion of IgG) and anti CCP antibody are present in 70-80% of cases. Anti CCP antibody are the most specific blood test for rheumatoid ahritis.', 'role': 'assistant'}]