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
Compression of a nerve within the carpal tunnel products inability to: 
Select and explain. 
A. Abduct the thumb, B. Adduct the thumb, C. Flex the distal phalanx of the thumb, D. Oppose the thumb
D: Oppose the thumb
Answer: D: Oppose the thumb 
Explanation: D i.e. Oppose the thumb