This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fracture Distal Femur, Subject name: Orthopaedics
[{'content': 'Injury to popliteal artery in fracture lower end of femur can be caused by - \nSelect and explain. \nA. Proximal fragment, B. Muscle haematoma, C. Distal fragment, D. Tissue swelling', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'C' i.e., Distal fragment o In distal third shaft fracture or supracondylar femur fracture, the distal fragment is tilted backward due to strong gastrocnemius pull. o This posteriorly tilted distal fragment can cause popliteal artery injury.", 'role': 'assistant'}]