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 young female patient reports to the dental office with complaint of small gaps between her teeth

Shade selection for such a treatment should be carried out under the 
Select and explain. 
A. Natural day light, B. Fluorescent light, C. After placement of rubber dam, D. When the teeth are dry
A: Natural day light
Answer: A: Natural day light 
Explanation: None