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: Surgery
In fracture of femur popliteal aery is commonly damaged by 
Select and explain. 
A. Proximal fragment, B. Distal fragment, C. Muscle haematoma, D. Tissue swelling
B: Distal fragment
Answer: B: Distal fragment 
Explanation: B i.e. Distal fragment lit fracture supracondylar femur, the distal fragmentQ is markedly displaced by gastrocnemius, thus risking to the popliteal aery.