This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Rheumatoid Ahritis, Subject name: Medicine
[{'content': 'All may be true about Rheumatoid Ahritis except: \nSelect and explain. \nA. Anti-MCV assay, B. RF positive, C. Anti- CCP antibody, D. Anti- Mi-2 antibody', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Anti Mi-2 antibodies are useful for diagnosis of dermatomyositis Laboratory studies in suspected RA fall into 3 categories--markers of inflammation, hematologic parameters, and immunologic parameters--and include the following:- Erythrocyte sedimentation rate (ESR) C-reactive protein (CRP) level Complete blood count (CBC) Rheumatoid factor (RF) assay Antinuclear antibody (ANA) assay Anti cyclic citrullinated peptide (anti-CCP) and anti mutated citrullinated vimentin (anti-MCV) assays', 'role': 'assistant'}]