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': 'The test performed below shows involvement of which of the following nerve? \nSelect and explain. \nA. Median nerve, B. Ulnar nerve, C. Radial nerve, D. Axillary nerve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. Median nervea. The image shows wrist hyperflexion being performed to test for involvement of median nerve involvement in carpal tunnel syndrome.b. This test is called Phalen test and in positive test leads to paresthesias in median nerve distribution.', 'role': 'assistant'}]