This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Joint disorders, Subject name: Anatomy
Heberdens ahropathy affects which joints mainly ? 
Select and explain. 
A. Lumbar spine, B. Symmetrically large joints, C. Sacroiliac joints, D. Distal interpharyngeal joints
D: Distal interpharyngeal joints
Answer: D: Distal interpharyngeal joints 
Explanation: In osteoahritis of hand Distal interpharyngeal joint-Heberdens node Proximal interpharyngeal joints -Bouchards node Refer Harrinson 20th/e p 2035/ maheswari 9th ed