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: Surgery
A boy fell down from a tree and has fracture of neck of humerus. He cannot raise his arm because of the involvement of: 
Select and explain. 
A. Axillary nerve, B. Supraspinatus nerve, C. Musculocutaneus nerve, D. Radial nerve
A: Axillary nerve
Answer: A: Axillary nerve 
Explanation: A i.e. Axillary nerve Axillary Nerve (C5C6) Motor supply - Deltoid (causing shoulder abduction) Q - Teres minorQ (laterally rotate the arm & stabilizes the shoulder joint) Sensory supply Skin over lower half of deltoid by upper lateral cutaneous nerve of armQ