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
Joint not involved in RA - 
Select and explain. 
A. PIP, B. DIP, C. Wrist, D. MCP
B: DIP
Answer: B: DIP 
Explanation: Ans. is 'b' i.e., DIPJointImportant arthritis involving the jointDistal interphalangeal jointProximal interphalangeal jointMetacarpophalangeal joint1st Carpometacarpal jointWristOsteoarthritis, Psoriatic arthritis, Reactive arthritisOsteoarthritis, RA, SLE, Psoriatic arthritisRA, pseudogout, hemochromatosisOsteoarthritisRA, Pseudogout, gonococcal arthritis, juvenile arthritisSpared jointo Wrist and MTPoDIPOsteoarthritisRA