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': 'Which of the following should be used to clean the operating site before giving composite restorations? \nSelect and explain. \nA. Pumice slurry, B. Prophy paste containing glycerine, C. prophy paste containing fluoride, D. all of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]