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': 'If the calcination process occurs under pressure in a 30% calcium chloride solution or in the presence of more than 1% of sodium succinate; type of gypsum product is called: \nSelect and explain. \nA. Alpha- hemihydate, B. Beta-hemihydrate, C. Modified beta hemihydrate, D. Modified alpha hemihydrate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Manufacture of high strength (α modified) stone\nThe gypsum is calcined by boiling it in 30% calcium chloride solution. The chlorides are then washed away or autoclaved in presence of sodium succinate 0.5%. These particles are the densest of all three types. After controlled grinding, these powders have an even higher apparent density and yield a stronger set.\nMicroscopically, they are cuboidal in shape.\nPhillips Science of Dental Materials ed 12 pg 183', 'role': 'assistant'}]