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': 'Thomas splint most troubling is: \nSelect and explain. \nA. Ring, B. Side bars, C. Gauze support, D. Traction attachment', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (a) Ringbecause it impinges against proximal thigh.', 'role': 'assistant'}]