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
Opposition of thumb involves 
Select and explain. 
A. Pronation, B. Supination, C. Adduction, D. Abduction
C: Adduction
Answer: C: Adduction 
Explanation: Opposition of thumb involves adduction, flexion & medial rotation at 1st carpo - metacarpal joint.