This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Shoulder and arm injuries, Subject name: Orthopaedics
[{'content': 'Most common nerve involvement in fracture surgical neck humerus is ? \nSelect and explain. \nA. Axillary nerve, B. Radial nerve, C. Ulnar nerve, D. Median nerve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Axillary nerve is paicularly vulnerable, both from the injury and from surgery Refer Maheshwari 6th/e p 92', 'role': 'assistant'}]