This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: AIIMS 2018, Subject name: Orthopaedics
Which Bone does not form the wrist joint 
Select and explain. 
A. Radius, B. Triquetrum, C. Scaphoid, D. Ulna
D: Ulna
Answer: D: Ulna 
Explanation: * Bones forming the wrist joint are: radius, scaphoid, lunate, triquetrum and other carpal bones.* The wrist joint is a synol joint between the distal end of radius and the aicular disc overlying the distal end of ulna and the scaphoid, lunate and triquetrum.* Ulna is not pa of wrist joint, only the overlying aicular disc is pa of the wrist joint.