This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Orthopaedics
[{'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: Joint involvement in OACommon joints: Knee, Hip, Spine (cervical, lumbosacral), Hand (PIP, DIP, first carpometacarpal), first tarsometatarsalUncommon joint: ShoulderSpared: Wrist, elbow, ankle, metacarpophalangealIn osteoahritis of hand:Distal interphalangeal joint:- Heberden's nodeProximal interphalangeal joint: bouchard's node(Refer: Mohindra's Fundamentals of Ohopedics, 2nd edition, pg no. 88, 101, 127)", 'role': 'assistant'}]