This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peripheral nerve injuries, Subject name: Orthopaedics
[{'content': 'Pen test is done for elliciting which nerve injury - \nSelect and explain. \nA. Median nerve, B. Ulnar nerve, C. Radial nerve, D. Axillary nerve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Pen test is used to test abductor pollicis brevis * supply by median nerve * action - abduction of the thumb * pen test - the patient is asked to lay his hand flat on the table with palm facing the ceiling .A pen is held above the thumb & the patient is asked to touch the pen with tip of the thumb .It will not possible in case of median nerve injury . REF:Essential ohopedics ,Maheshwari, 5th edition ,pg.no.66', 'role': 'assistant'}]