This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Arthritis, Subject name: Orthopaedics
[{'content': 'Feature of osteoarthritis is - \nSelect and explain. \nA. Heberden node, B. Increased ESR, C. Onycholysi, D. Z deformity', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e.. Heberden nodeJoint involvement in QAo Common joints : Knee, Hip, Spine (cervical, lumbosacral), Hand (PIP, DIP, first carpometacarpal), first tarsometatarsal.o Uncommon joint: Shouldero Spared : Wrist, elbow, ankle, metacarpophalangeal.o In osteoarthritis of hand :Distal interphalangeal joint Heberden's node.Proximal interphalangeal jointBouchard's node", 'role': 'assistant'}]