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': 'Silica whose inversion temperature is below fusion temperature \nSelect and explain. \nA. Cristoballite, B. Tridymite, C. Silica, D. Fused Quartz', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]