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: Anatomy
Supination - pronation occurs at ? 
Select and explain. 
A. Wrist joint, B. Radiocarpal joint, C. Radio-ulnar joint, D. Elbow joint
C: Radio-ulnar joint
Answer: C: Radio-ulnar joint 
Explanation: Radio-ulnar joint