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': 'Calcination of CaSO42H2O at 130° leads to formation of \nSelect and explain. \nA. Alpha/ Beta - hemihydrate, B. Orthorhombic anhydrite, C. Hexagonal Anhydrite, D. Decrystallization', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]