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
[{'content': 'Treatment of choice in 65 year old female with impacted neck of humerus is: \nSelect and explain. \nA. Triangular sling, B. Arm chest strapping, C. Ahroplasty, D. Observation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Triangular sling', 'role': 'assistant'}]