This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Agents used for sclerotherapy in varicose veins are all except 
Select and explain. 
A. Ethanolamine oleate, B. Sodium tetradecyl sulphate, C. Polidocanal, D. Mannitol
D: Mannitol
Answer: D: Mannitol 
Explanation: Mannitol is not a sclerosing agent.