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
[{'content': 'Which one of the following does not cause deep vein thrombosis \nSelect and explain. \nA. Estrogen, B. Thrombocytosis, C. Venous stasis, D. Sickle cell Anemia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Sickle cell anemia does not cause DVT. They cause vaso-occlusive crisis by plugging the microcirculation (aggregate of Sickle cell are formed in the capillaries because of hypoxia).', 'role': 'assistant'}]