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
Which is a prerequisite for shade selection for composites? 
Select and explain. 
A. Tooth should not be dry as drying increases translucency, B. Tooth should not be wet as moisture increases translucency, C. Tooth should not be dry as drying decreases translucency, D. Tooth should not be wet as it decreases translucency
C: Tooth should not be dry as drying decreases translucency
Answer: C: Tooth should not be dry as drying decreases translucency 
Explanation: Shade of the tooth is determined before teeth are subjected to drying because dehydrated tooth becomes lighter in colour as a result of decrease in translucency.
Thus shade is selected on a wet tooth.
Reference- Sturdevant 6th ed Pg-483