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': 'Feature of osteoahritis is - \nSelect and explain. \nA. Heberden node, B. Increased ESR, C. Onycholysis, D. Z deformity', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Heberden node Joint involvement in OA Common joints : Knee, Hip, Spine (cervical, lumbosacral), Hand (PIP, DIP, first carpometacarpal), first tarsometatarsal. Uncommon joint : Shoulder Spared : Wrist, elbow, ankle, metacarpophalangeal. In osteoahritis of hand : Distal interphalangeal joint :- Heberden's node. Proximal interphalangeal joint :- Bouchard's node", 'role': 'assistant'}]