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: Orthopaedics
[{'content': 'A boy fell down from a tree and has fracture of neck of humerus. He cannot raise his arm because of the involvement of- \nSelect and explain. \nA. Axillary nerve, B. Supraspinatus nerve, C. Musculocutaneous nerve, D. Radial nerve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nerve injured in the fracture of neck of humerus is axillary nerve.', 'role': 'assistant'}]