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': 'Osteoahritis does not involve? \nSelect and explain. \nA. Hip joint, B. DIP, C. Ankle joint, D. Cervical region', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ankle joint REF: Harrison's 18th ed chapter 332 Commonly affected joints in osteoahritis include: Cervical and lumbosacral spine, hip, knee, and first metatarsal phalangeal joint (MTP). In the hands, the distal interphalangeal joints (heberden's node, most common) and proximal interphalangeal joints (bouchard's node) and the base of the thumb (1st CMC) are often affected. Joints usually spared are: Wrist Elbow Ankle MCP Radiological features of OA: Narrowing of joint space (earliest feature) Sclerosis of subchondral bone Cystic lesions, osteophytes, loose bodies.", 'role': 'assistant'}]