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': 'Ahritis involving DIP, PIP, 1st carpometacarpal with sparing of MCP and wrist joints is typical of ? \nSelect and explain. \nA. Osteoahritis, B. Rheumatoid ahritis, C. Ankylosing spondylitis, D. Psoriatic ahritis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Osteoahritis", 'role': 'assistant'}]