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
A second choice of tooth isolation is by: 
Select and explain. 
A. Cotton rolls, B. Cotton roll holders, C. Absorbent wafers, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Partial  isolation  with  cotton  rolls,  absorbent  wafers  and saliva  ejector  provides  rapid  and  effective  control  of  the operative field for some limited procedures in  which absolute dryness  is not required.