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
Which one of the following provides most conservative approach while restoring the tooth? 
Select and explain. 
A. Cast gold, B. Dental amalgam, C. Glass ionomer cement, D. Composite resin
D: Composite resin
Answer: D: Composite resin 
Explanation: None