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
Which is the most common cause of acquired aeriovenous fistula? 
Select and explain. 
A. Blunt trauma, B. Fungal infection, C. Bacterial infection, D. Penetrating trauma
D: Penetrating trauma
Answer: D: Penetrating trauma 
Explanation: Acquired aeriovenous fistulas are caused by aificial connections between adjacent aeries and veins. Penetrating injuries are the most common cause of acquired aeriovenous fistula. Other causes includes creating vascular access for hemodialysis, as complications of aerial catheterization or surgical dissection and rarely it can be caused by rupture of an aerial aneurysm into a vein. Ref: Bailey and Love Sho Practice of Surgery, 25th Edition, Page 596; Harrison's Principles of Internal Medicine, 18th Edition, Chapter 249.