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': 'In fracture of femur popliteal artery is commonly damaged by - \nSelect and explain. \nA. Proximal fragment, B. Distal fragment, C. Muscle haematoma, D. Tissue swelling', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In distal third shaft fracture or supracondylar femur fracture, the distal fragment is tilted backwards due to strong gastrocnemius pull.\nThis posteriorly tilted distal fragment can cause popliteal artery injury.', 'role': 'assistant'}]