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
At low levels of light, the colour perception of the eyes is lost. As the brightness becomes more intense, colour appears to change. This phenomenon is known as 
Select and explain. 
A. Metamerism, B. Fluorescence, C. Reflection Effect, D. Bezold-Brucke effect
D: Bezold-Brucke effect
Answer: D: Bezold-Brucke effect 
Explanation: None