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
[{'content': 'Marked deformity is due to \nSelect and explain. \nA. Radial nerve, B. Posterior interosseous nerve, C. Ulnar nerve, D. Median nerve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Given action - wrist drop Due to radial nerve injury PIN palsy causes - finger drop not wrist drop', 'role': 'assistant'}]