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: Medicine
Joint which is usually spared in Osteoarthritis 
Select and explain. 
A. Knee Joint, B. PIP, C. DIP, D. Wrist Joint
D: Wrist Joint
Answer: D: Wrist Joint 
Explanation: Joint spared in Osteoarthritis:

Wrist, Elbow, Ankle.
Metacarpo phalangeal joints.
Carpometacarpal joints (except base of thumb).