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': "All of the following measure the plaque index except: \nSelect and explain. \nA. Ramjford index, B. Moller's index, C. OHI-S index, D. Loe and Silness", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]