This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy (Arterial Disorders), Subject name: Surgery
[{'content': 'Most common cause of acquired AV fistula is - \nSelect and explain. \nA. Bacterial infection, B. Fungal infection, C. Blunttrauma, D. Penetrating trauma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is \'d\' i.e., Penetrating trauma "Penetrating injuries are the most common cause, but fistulas are sometimes seen after blunt trauma " - CSDT', 'role': 'assistant'}]