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
Highest slope of stress v/s strain curve seen in: 
Select and explain. 
A. Ceramic, B. Enamel, C. Impression compound, D. Gold crown
D: Gold crown
Answer: D: Gold crown 
Explanation: Elastic modulus of different materials