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
Varicose vein surgery is contraindicated in - 
Select and explain. 
A. Varicose ulcers, B. Deep vein Thrombosis, C. Pigmentation Over limb, D. Hemorrhoides
B: Deep vein Thrombosis
Answer: B: Deep vein Thrombosis 
Explanation: 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