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
Light cure system, side effect is: 
Select and explain. 
A. Iritis, B. Cataract, C. Conjunctivitis, D. Retinal damage
D: Retinal damage
Answer: D: Retinal damage 
Explanation: None