This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nerve Lesions, Subject name: Anatomy
Marked deformity is due to 
Select and explain. 
A. Radial nerve, B. Posterior interosseous nerve, C. Ulnar nerve, D. Median nerve
A: Radial nerve
Answer: A: Radial nerve 
Explanation: Given action - wrist drop Due to radial nerve injury PIN palsy causes - finger drop not wrist drop