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 depth of cure for lighter shades of composites is often: 
Select and explain. 
A. 2 mm, B. 3 mm, C. 4 mm, D. 5 mm
D: 5 mm
Answer: D: 5 mm 
Explanation: The boundary between somewhat cured and uncured material is called the depth of cure and is often 5 mm for light vita shades (A2 or A3) of material.