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': 'The addition of which of the following can accelerate the setting time of zinc oxide cement: \nSelect and explain. \nA. Zinc acetate, B. Barium sulphate, C. Zinc sulphate, D. Barium chloride', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]