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: Surgery
[{'content': 'Most specific antibody seen in RA \nSelect and explain. \nA. Anti CCP, B. Rheumatoid factor, C. ANA, D. Anti dsDNA', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer- A. Anti CCPThe presence of serum anti-CCP antibodies has about the same sensitivity as serum RF for the diagnosis of RA.However, its diagnostic specificity approaches 95% (most specific for RA), so a positive test for anti-CCP antibodies in the setting of an early inflammatory ahritis is usefrrlfor distinguishing RA from other forms of ahritis.', 'role': 'assistant'}]