This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Rheumatoid Arthritis, Subject name: Orthopaedics
[{'content': 'Arthritis involving DIP, PIP, 1st carpometacarpal with sparing of MCP and wrist joints is typical of - \nSelect and explain. \nA. Osteoarthritis, B. Rheumatoid arthritis, C. Ankylosing spondylitis, D. Psoriatic arthritis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Osteoarthritis JointImportant arthritis involving the jointDistal interphalangeal jointProximal interphalangeal jointMetacarpophalangeal joint1st Carpometacarpal jointWristOsteoarthritis, Psoriatic arthritis, Reactive arthritisOsteoarthritis, RA, SLE, Psoriatic arthritisRA. pseudogout, hemochromatosisOsteoarthritisRA, Pseudogout, gonococcal arthritis, juvenile arthritisSpared jointo Wrist and MTPo DIPOsteoarthritisRA", 'role': 'assistant'}]