This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper Extremity, Subject name: Anatomy
Wrist drop is due to injury to which nerve: 
Select and explain. 
A. Median, B. Ulnar, C. Axillary, D. Radial
D: Radial
Answer: D: Radial 
Explanation: Ans. D. RadialWrist drop, is a medical condition in which the wrist and the fingers cannot extend at the metacarpophalangeal joints & wrist joint. The wrist remains partially flexed due to an opposing action of flexor muscles of the forearm. It is due to injury to radial nerve.