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': 'Green strength with reference to plaster means \nSelect and explain. \nA. Dry strength, B. Compressive strength, C. Strength of dental stone due to green colour, D. The wet strength', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Two strength properties of gypsum are reported:\n\nWet strength (also known as green strength),.\nDry strength.\n\nThe wet strength is\xa0the\xa0strength\xa0that\xa0is\xa0determined\xa0when\xa0water\xa0in excess\xa0of\xa0that\xa0required\xa0for\xa0hydration\xa0of\xa0the\xa0hemihydrate remains\xa0in\xa0the\xa0test\xa0specimen.\xa0When\xa0such\xa0excess\xa0water\xa0is removed by drying, the strength obtained is the dry strength. The dry strength may be two or more times as high as the wet strength. Consequently, the distinction between the two is of considerable importance.\nPhillips Science of Dental Materials ed 12 pg 188', 'role': 'assistant'}]