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': 'Most common accelerator added to gypsum product \nSelect and explain. \nA. Sodium Chloride, B. Potassium sulphate, C. Sodium Phosphate, D. Acetates', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]