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': "In the management of patients with Vincent's infection, the preferred therapeutic agents are \nSelect and explain. \nA. Hydrogen peroxide mouthwash and metronidazole, B. Cephalosporins and hydrogen peroxide mouthwash, C. Chtorhexidine mouthwash and metronidazole, D. Crystalline penicillin and chlorhexidine mouthwash", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]