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': 'Varicose vein surgery is contraindicated in - \nSelect and explain. \nA. Varicose ulcers, B. Deep vein Thrombosis, C. Pigmentation Over limb, D. Hemorrhoides', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is \'b\' deep vein Thrombosis Ref Bailey & love, 24/e, p 963 (23/e, p 245)Surgical treatment of varicose vein is widely used and is effecive in removing varicose veins of the main saphenous trunks, as well as their tributaries, down to a size of about 3 mm. Veins smaller than this are best treated by Sclerotherapy. Surgical removal of varices is inappropriate where these form a major part of the venous drainage of the limb, for example where a deep vein thrombosis has destroyed the main axial limb veins and the pt. relies on the superficial veins." - Bailey & Love', 'role': 'assistant'}]