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
[{'content': 'A patient presents with hypothenar muscle wasting and loss of sensation of medial one and a half digits. Which nerve is involved? \nSelect and explain. \nA. Ulnar nerve, B. Median nerve, C. Radial nerve, D. Musculocutaneous nerve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A Ulnar nerve# The shown course of nerve is of ulnar nerve# Please refer the image below', 'role': 'assistant'}]