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
All are predisposing factors of Deep Vein thrombosis, EXCEPT : 
Select and explain. 
A. Cushing's syndrome, B. Hip surgery, C. Lower limb trauma, D. Subungual melanoma
D: Subungual melanoma
Answer: D: Subungual melanoma 
Explanation: Ans is 'd' Subungual melanoma