This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Joints, Subject name: Anatomy
Supination and pronation of upper limb is due to: 
Select and explain. 
A. Wrist joint, B. Radio-ulnar joint, C. Elbow joint, D. Carpometacarpal joint
B: Radio-ulnar joint
Answer: B: Radio-ulnar joint 
Explanation: Ans. (b) Radio-ulnar jointRef.: BDC 6th ed. vol. I /153-154; Clinically Oriented Anatomy by Keith, Moore, 5th ed/ 865* During Supination radius rotates laterally and palm laces anteriorly* During pronation, radius rotates medially and palm faces posteriorly* This movement takes place around distal radio-ulnar joint.