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': 'Impression plaster containing potato starch is called: \nSelect and explain. \nA. Plaster of paris, B. Soluble plaster, C. Anti — expansion solution, D. Die stones', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]