This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hemodynamics, Subject name: Pathology
[{'content': "All are predisposing factors of Deep Vein thrombosis, EXCEPT : \nSelect and explain. \nA. Cushing's syndrome, B. Hip surgery, C. Lower limb trauma, D. Subungual melanoma", 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans is 'd' Subungual melanoma", 'role': 'assistant'}]