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
[{'content': 'Alkaline Nasal Douche does not contain \nSelect and explain. \nA. Sodium chloride, B. Sodium bicarbonate, C. Sodium biborate, D. Trisodium citrate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]