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
[{'content': 'Pulsating varicose vein in a young adult is due to? \nSelect and explain. \nA. Aeriovenous fistula, B. Sapheno femoral incompetence, C. Deep vein thrombosis, D. Abdominal tumour', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Aeriovenous fistula", 'role': 'assistant'}]