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': 'Most common site of deep vein thrombosis is \nSelect and explain. \nA. Femoral veins, B. Popliteal veins, C. Pelvic veins, D. Tibial vein', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Pelvic veins are most commonly affected site in DVT.', 'role': 'assistant'}]