This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lower Limb Traumatology, Subject name: Orthopaedics
[{'content': "Gallow's traction is used for: \nSelect and explain. \nA. Fracture shaft femur, B. Fracture shaft humerus, C. Fracture ulna, D. Spine injury", 'role': 'user'}, {'content': 'Answer: A \nExplanation: -Gallows traction for fracture shaft of femur in less than 2 years of age -Tractions used for other fractures: Fracture shaft of humerus: sugar tong Spine injury: head halter traction, crutchfield traction', 'role': 'assistant'}]