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 side of rubber dam facing occlusal side of isolated teeth is: 
Select and explain. 
A. Shiny side, B. Dull side, C. Any side, D. Both sides are dull and can be used in either direction
B: Dull side
Answer: B: Dull side 
Explanation: Rubber dam material has a shiny and dull side.
Because the dull side is less light reflective, it is generally placed facing the occlusal of the isolated teeth.