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
Calcination of CaSO42H2O at 130° leads to formation of 
Select and explain. 
A. Alpha/ Beta - hemihydrate, B. Orthorhombic anhydrite, C. Hexagonal Anhydrite, D. Decrystallization
A: Alpha/ Beta - hemihydrate
Answer: A: Alpha/ Beta - hemihydrate 
Explanation: None