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
Treatment of choice in 65-year-old female with impacted # neck of the humerus is - 
Select and explain. 
A. Triangular sling, B. Arm chest strapping, C. Arthroplasy, D. Observation
A: Triangular sling
Answer: A: Triangular sling 
Explanation: Impacted fracture of surgical neck humerus is treated by rest of the arm in triangular sling.