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
Enameloplasty 
Select and explain. 
A. 1/3 of enamel is removed, B. 1/2 of enamel is removed, C. 1/4 of enamel is removed, D. Fissures are broadened and made self-cleansable
D: Fissures are broadened and made self-cleansable
Answer: D: Fissures are broadened and made self-cleansable 
Explanation: None