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': 'Type III Dental gypsum is \nSelect and explain. \nA. Class II stone, B. Densite, C. Class I stone or hydrocal, D. Model or lab plaster', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Type 3 OR dental stone, model\nSynonym\xa0 Class I stone or Hydrocal\xa0\nUses\nFor preparing master casts and to make molds.', 'role': 'assistant'}]