This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': 'Anatomical snuff box content: \nSelect and explain. \nA. Radial artery, B. Axillary nerve, C. Brachial artery, D. Ulnar artery', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Anatomical snuff box is a depression which appears on the lateral aspect of wrist and becomes prominent when thumb is extended.\nBOUNDARIES.\n\nAnteriolateral Radial- abductor pollicis longus and extensor pollicis brevis\nPostero-medial ulnar - extensor\xa0pollicis longus\nFloor- scaphoid and trapezium\nRoof- subcutaneous tissue and skin.', 'role': 'assistant'}]