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
Metamerism is 
Select and explain. 
A. Operator is unable to record the colour, B. Patient has teeth with different shades, C. Various light sources produce different colour perception, D. All of the above
C: Various light sources produce different colour perception
Answer: C: Various light sources produce different colour perception 
Explanation: None