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
The most common cause of acquired aeriovenous 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: . Trauma is the most common cause of accquired atreiovenous fistula(AV fistula).most common sites involved are femoral region,brachial region,popliteal region,wrist,aoa-vena canal,abdomen.It may be following road traffic accidents,penetrating wounds,cock fight injury(common in south india).Other causes includes after surgical intervention of major vessels,cimino fistula(AVF created for renal dialysis). Refer page no 219 of SRB's manual of surgery 5th edition.