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
Treatment of choice in 65 year old female with impacted neck of humerus is: 
Select and explain. 
A. Triangular sling, B. Arm chest strapping, C. Ahroplasty, D. Observation
A: Triangular sling
Answer: A: Triangular sling 
Explanation: A i.e. Triangular sling