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
Which of the following is not a sclerosing agent? 
Select and explain. 
A. Sodium psylliate, B. Sodium morrhuate, C. Sodium tetradecyl sulphate, D. Sodium bicarbonate
D: Sodium bicarbonate
Answer: D: Sodium bicarbonate 
Explanation: None