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
The thickness of thin rubber dam is: 
Select and explain. 
A. 0.002 inch, B. 0.004 inch, C. 0.006 inch, D. 0.2 inch
C: 0.006 inch
Answer: C: 0.006 inch 
Explanation: None