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': 'Which of the following impression material is elastic: \nSelect and explain. \nA. Impression compound, B. Zinc oxide eugenol (ZOE) paste, C. Wax, D. Polyvinyl siloxane', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]