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': 'The initial setting time for the following impression paste is: \nSelect and explain. \nA. 3-6 min, B. 5-10 min, C. 10-12 min, D. 1-3 min', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Initial setting time is the period from the beginning of the mixing until the material ceases to pull away or string out when its surface is touched with a metal rod of specified dimensions. The impressions should be seated in the mouth before the initial set.\nThe final set occurs when a needle of specified dimension fails to penetrate the surface of the specimen more than 0.2 mm under a load of 50 gm.', 'role': 'assistant'}]