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: Anatomy
All of the following bones are involves in wrist joint formation EXCEPT? 
Select and explain. 
A. Scaphoid, B. Ulna, C. Radius, D. Triquetral
B: Ulna
Answer: B: Ulna 
Explanation: Wrist joint aka radiocarpal joint is a synol, ellipsoid joint formed by: - Ulna: - Forms inferior radioulnar joint Function: pronation & supination Separated from wrist joint by an aicular disc. Wrist joint formed by: - Upper: Inferior surface of lower end of radius Aicular disc of the inferior radioulnar joint Lower: Scaphoid Lunate Triquetral (ulnar detion)