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': 'Crucible indicated for casting base metal alloys is: \nSelect and explain. \nA. Carbon crucible, B. Clay crucible, C. Quartz crucible, D. High melting plastic crucible', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]