This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Rheumatoid Arthritis, Subject name: Orthopaedics
Heberden node denotes involvement of - 
Select and explain. 
A. Distal inetrphalangeal joint, B. Proximal interpbalangel joint, C. Metacarpophalangeal joint, D. Metatarsophalangeal joint
A: Distal inetrphalangeal joint
Answer: A: Distal inetrphalangeal joint 
Explanation: Ans. is 'a' i.e., Distal inetrphalangeal joint o In osteoarthritis of hand : Distal interphalangeal joint Heberden s nodeProximal interphalangeal joint Bouchard's node