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': 'True regarding gypsum bonded investments is: \nSelect and explain. \nA. After dehydration all forms of gypsum shrink between 200-400 degree Celsius., B. Between 400-700 degree Celsius a slight expansion is noted., C. Lateral shrinkage in gypsum is caused due to decomposition and release of sulphur dioxide., D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: After dehydration all forms of gypsum shrink between 200-400° C.\nBetween 400 and 700° C, a slight expansion is noted.\nLateral shrinkage in gypsum is caused due to the decomposition and the release of sulfur dioxide.\nIt is imperative, that gypsum investment should not be heated above 700° C.\n\nPhillip’s 12th edition page 201', 'role': 'assistant'}]