This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Management in Orthopedics, Subject name: Orthopaedics
[{'content': 'U-slab is given for fracture of - \nSelect and explain. \nA. Femur, B. Radius, C. Tibia, D. Humerus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Traction by gravity - This applies only to upper limb injuries. Thus, with a wrist sling the weight of the arm provides continuous traction to the humerus. For comfo and stability, especially with a transverse fracture, a U-SLAB of plaster may be bandaged on. REF:Apley&;s system of ohopaedics- 9th edn- pg no 697 .', 'role': 'assistant'}]