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: Dental
[{'content': 'Mouthwash used in ANUG is \nSelect and explain. \nA. Chlorhexidine, B. Normal saline, C. Hydrogen peroxide, D. Stannous fluoride', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]