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
[{'content': 'Opposition of thumb involves \nSelect and explain. \nA. Pronation, B. Supination, C. Adduction, D. Abduction', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Opposition of thumb involves adduction, flexion & medial rotation at 1st carpo - metacarpal joint.', 'role': 'assistant'}]