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: Orthopaedics
Median nerve injury at the wrist causes - 
Select and explain. 
A. Claw hand, B. Loss of apposition of thumb, C. Policeman's tip deformity, D. Saturday night palsy
B: Loss of apposition of thumb
Answer: B: Loss of apposition of thumb 
Explanation: Injury at the wrist or in carpal tunnel produces low median nerve palsy.
Long flexors of fingers are spared and there is paralysis of thenar muscles only.
Following features are seen : -


Pentest for abductor pollicis Brevis paralysis.
Loss of opposition and abduction of thumb.
Ape thumb deformity
Loss of sensation of lateral 31/2 fingers and lateral 2/3 of palm.


In contrast to high median nerve palsy, pointing index and Benediction test is not seen as long fexors are spared in low median nerve palsy