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: Orthopaedics
Heberden's nodes are seen in: 
Select and explain. 
A. Osteoahritis of the Distal interphalangeal joints, B. Osteoahritis of the Proximal interphalangeal joints, C. Rheumatoid ahritis of the 1st carpometacarpal joint, D. Rheumatoid ahritis of the Distal interphalangeal joints
A: Osteoahritis of the Distal interphalangeal joints
Answer: A: Osteoahritis of the Distal interphalangeal joints 
Explanation: Osteoahritis characteristically involves distal interphalangeal joint (Heberden's node), proximal interphalangeal joint (Bouchard's node), 1st carpometacarpal joint (base of thumb) of hand with sparing of metacarpophalangeal joint and wrist joint.