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
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: Ans. is 'd' i.e., Below inguinal ligament 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)