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
Calcium and alginate added during mixing of alginate will cause: 
Select and explain. 
A. Accelerate alginate setting., B. Retard alginate setting., C. No effect on setting., D. None of the above.
A: Accelerate alginate setting.
Answer: A: Accelerate alginate setting. 
Explanation: Any addition of Calcium and alginate during mixing leads to reduced or surpasses the ability of trisodium phosphate to retard the reaction and a very fast setting reaction and the formation of an insoluble calcium alginate occurs.