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 of the following materials has the highest linear coefficient of expansion? 
Select and explain. 
A. Amalgam, B. Direct gold, C. Tooth structure, D. Composite resin
D: Composite resin
Answer: D: Composite resin 
Explanation: Composite materials exhibit more dimensional change (2.5 times greater than tooth structure) when subjected to extreme changes in temperature than do the other choices. Direct gold is slightly higher than tooth structure and amalgam is about twice as high as tooth structure.