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
Most common cause of acquired AV fistula is 
Select and explain. 
A. Bacterial infection, B. Fungal infection, C. Blunt trauma, D. Penetrating trauma
D: Penetrating trauma
Answer: D: Penetrating trauma 
Explanation: . Ans : (d) Penetrating Trauma Penetrating injuries are the most common cause , but fistulas are sometimes seen after blunt trauma . Fungal and bacterial infections are not much common as penetrating trauma in acquired AV fistula.