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 shows least setting time: \nSelect and explain. \nA. Polysulphide., B. Condensation silicone., C. Addition silicone., D. Polyether', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]