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: Pathology
[{'content': 'Most common site of venous thrombosis:March 2013 \nSelect and explain. \nA. Veins of upper extremity, B. Veins of lower extremity, C. Dural sinus, D. Poal vein', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B i.e. Veins of lower extremityCommoner sites of venous thrombosis includes deep vein in the lower extremity below the knee and superficial saphenous, hepatic and renal veins; dural sinuses.', 'role': 'assistant'}]