This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Aerial disorders, Subject name: Surgery
Commonest cause of A-V fistulae is:- 
Select and explain. 
A. Congenital, B. Traumatic, C. Surgical creation, D. Tumor erosion
A: Congenital
Answer: A: Congenital 
Explanation: Aeriovenous Fistula (AVF) MC type of AVF: Congenital MC cause of acquired AVF: Penetrating trauma