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
The addition of which of the following can accelerate the setting time of zinc oxide cement: 
Select and explain. 
A. Zinc acetate, B. Barium sulphate, C. Zinc sulphate, D. Barium chloride
A: Zinc acetate
Answer: A: Zinc acetate 
Explanation: None