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': '"Two in one stage" impression materials include \nSelect and explain. \nA. Zinc-Oxide eugenol impression paste, B. Hydrocolloid impression material, C. Elastomeric impression material, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]