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: ENT
Alkaline Nasal Douche does not contain 
Select and explain. 
A. Sodium chloride, B. Sodium bicarbonate, C. Sodium biborate, D. Trisodium citrate
D: Trisodium citrate
Answer: D: Trisodium citrate 
Explanation: None