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': 'For accurate replica reproducing intra and extraoral tissues, impression materials are able to transform into a rubbery or rigid solid in the mouth within \nSelect and explain. \nA. 2 min, B. 7 min, C. 10 min, D. 15 min', 'role': 'user'}, {'content': 'Answer: B \nExplanation: To produce accurate replicas of intra and extra oral tissues, the impression materials should be:\n\nSufficiently fluid to adapt to the oral tissues.\xa0\nViscous enough to be contained in a tray.\xa0\nAble to transform (set) into a rubbery or rigid solid in the mouth in a reasonable time (less than 7 min).\xa0\nResistant to distortion or tearing\xa0when\xa0removed\xa0from the mouth.\xa0\nDimensionally stable long enough to allow one or more casts to\xa0be\xa0poured.\xa0\xa0\nBiocompatible.\nCost-effective in terms of time as well as the expense of the associated processing equipment.\n\nPhillips 12 ed page no 152', 'role': 'assistant'}]