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
Most common accelerator in gypsum is 
Select and explain. 
A. NaF, B. Aluminosilicate, C. Potassium sulphate, D. Potassium fluoride
C: Potassium sulphate
Answer: C: Potassium sulphate 
Explanation: None