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': "Heberden's Ahropathy affects: \nSelect and explain. \nA. Lumbar spine, B. Symmetrically large joints, C. Sacroiliac joints, D. Distal interphalangeal joints", 'role': 'user'}, {'content': "Answer: D \nExplanation: Heberden's node is a disfigurement of the interphalangeal joints as a result of severe osteoahritis. Ref:Harrison's Principles of Internal Medicine, 16th Edition, Pages 2037, 2040", 'role': 'assistant'}]