This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Venous Disorders, Subject name: Surgery
Contraindication for surgery in varicose veins:- 
Select and explain. 
A. DVT, B. Multiple incompetent perforators, C. Ulcer at ankle, D. None
A: DVT
Answer: A: DVT 
Explanation: DVT is the contraindication for surgery in varicose veins as superficial veins are only channel for drainage of venous blood .