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': 'A second choice of tooth isolation is by: \nSelect and explain. \nA. Cotton rolls, B. Cotton roll holders, C. Absorbent wafers, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Partial\xa0 isolation\xa0 with\xa0 cotton\xa0 rolls,\xa0 absorbent\xa0 wafers\xa0 and\xa0saliva\xa0 ejector\xa0 provides\xa0 rapid\xa0 and\xa0 effective\xa0 control\xa0 of\xa0 the\xa0operative field for some limited procedures in\xa0 which absolute\xa0dryness\xa0 is not required.', 'role': 'assistant'}]