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
A 21 year male with fracture surgical neck humerus presented with regimental badge sign and difficulty in abduction, most likely to be injured 
Select and explain. 
A. Ulnar nerve injury, B. Axillary nerve injury, C. Klumpke's paralysis, D. Supraclavicular nerve injury
B: Axillary nerve injury
Answer: B: Axillary nerve injury 
Explanation: None