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
[{'content': 'Hanging cast is used in - \nSelect and explain. \nA. # Femur, B. # Radius, C. # Tibia, D. # Humerus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Most of the closed fractures can be treated by "hanging cast" from shoulder to wrist with the elbow flexed to 90°.\nOther methods of conservative treatment are U-slab, chest arm bandage, and functional cast brace (Sarmiento).', 'role': 'assistant'}]