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
Co-efficient of thermal expansion is highest for: 
Select and explain. 
A. Amalgam, B. Silicate cement, C. Gold alloy, D. Acrylic resin
D: Acrylic resin
Answer: D: Acrylic resin 
Explanation: None