This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vascular surgery, Subject name: Surgery
Perforators are not present at 
Select and explain. 
A. Ankle, B. Medial calf, C. Distal to calf, D. Below inguinal ligament
D: Below inguinal ligament
Answer: D: Below inguinal ligament 
Explanation: Blood flows from the superficial to the deep veins through perforating (communicating veins) Perforators are located below the medial malleolus (inframalleolar perforator) in the medial calf (Cockett perforators) just above (Dodd perforator) & below the knee (Boyd perforator) at the level of the adductor canal (Hunterian perforator)