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
[{'content': 'Perforators are not present at - \nSelect and explain. \nA. Ankle, B. Medial calf, C. Distal to calf, D. Below inguinal ligament', 'role': 'user'}, {'content': "Answer: D \nExplanation: 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)", 'role': 'assistant'}]