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': 'Coefficient of thermal expansion of the wax is: \nSelect and explain. \nA. 30×10-6/°C, B. 50×10-6/°C, C. 350×10-6/°C, D. 35×10-6/°C', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Waxes have low thermal conductivity and a high coefficient of thermal expansion.', 'role': 'assistant'}]