This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Joint disorders, Subject name: Orthopaedics
[{'content': 'In a case of undifferentiated ahritis, presence of anti-cyclic citrullinated peptide {anti CCP} indicates strong possibility of which of the following? \nSelect and explain. \nA. Rheumatoid ahritis, B. Systemic lupus erythematosis, C. Mixed connective tissue disorder, D. Reactive ahritis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: REF : MAHESWARI 9TH ED', 'role': 'assistant'}]