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
Drug used for sclerotherapy of varicose veins are the following except: 
Select and explain. 
A. Ethanolamine oleate, B. Polidocanol, C. Ethanol, D. Sodium tetradecyl sulfate
C: Ethanol
Answer: C: Ethanol 
Explanation: Ans. (c) EthanolRef: Sabiston 19th Edition, Page 1809Sclerosing Agents:* 5% phenol in almond oil* Ethanolamine Oleate 5% in 25% glycerine and 2% benzyl alcohol* Sodium tetra decyl sulphate (3%) with Benzyl alcohol* Hypertonic Saline