This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Varicose Veins, Subject name: Surgery
[{'content': 'Contraindication for surgery in varicose veins - \nSelect and explain. \nA. DVT, B. Multiple incompetent perforators, C. Ulcer at ankle, D. None', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., DVT o Deep vein thrombosis is a contraindication for t/t of varicose veins.o Varicose vein surgery should never be attempted in a case where deep vein thrombosis exists along with varicose veins, because in these cases superficial veins are the only valved venous pathway and excising them will only aggravate the condition.", 'role': 'assistant'}]