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
Most appropriate method of isolation during tooth preparation in vital tooth: 
Select and explain. 
A. Cotton rolls, B. Salivary ejector, C. Isolation with rubber dam, D. Svedopter
C: Isolation with rubber dam
Answer: C: Isolation with rubber dam 
Explanation: None