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
[{'content': 'Supination and pronation of upper limb is due to: \nSelect and explain. \nA. Wrist joint, B. Radio-ulnar joint, C. Elbow joint, D. Carpometacarpal joint', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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.', 'role': 'assistant'}]