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': 'Chlorhexidine is a useful mouth wash as \nSelect and explain. \nA. It prevents plaque accumulation, B. It prevents bacterial proliferation, C. It breaks down plaque matrix, D. It causes hemostatsis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]