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
[{'content': 'Highest slope of stress v/s strain curve seen in: \nSelect and explain. \nA. Ceramic, B. Enamel, C. Impression compound, D. Gold crown', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Elastic modulus of different materials', 'role': 'assistant'}]