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': 'Composites usually do not need pulp thermal protection below it because they have: \nSelect and explain. \nA. High Linear coefficient of thermal expansion, B. High density, C. Low thermal conductivity, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Composites usually donot need liners and bases for thermal protection as they are poor conductors of heat and have low thermal conductivity. They may need liners for pulp capping and also to reduce effects of polymerization shrinkage but not for thermal protection.\nReference- Sturdevant 6th ed', 'role': 'assistant'}]