This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'Chemically, Plaster of Paris (POP) is \nSelect and explain. \nA. Calcium carbonate, B. Calcium sulphate, C. Anhydrous calcium sulphate, D. Hemihydrous calcium sulphate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: chemical name is calcium sulfhate hemihydrate , called plaster of paris since obtained from gypsum in paris.', 'role': 'assistant'}]