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': 'CASPAR criteria is used in diagnosis \nSelect and explain. \nA. Psoriatic ahritis, B. Rheumatoid ahritis, C. Ankylosing spondylitis, D. Reactive Synovitis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Classification criteria for Psoriatic ahritis is used in the diagnosis of psoriatic ahropathy Refer : maheswari 9th ed', 'role': 'assistant'}]