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 one of the following impression materials is elastic, sets by a chemical reaction and is catalyzed by chloroplatinic acid \nSelect and explain. \nA. Condensation silicone, B. Polyether, C. Polysulfide, D. Poly vinyl siloxane', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]