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': 'Calcium and alginate added during mixing of alginate will cause: \nSelect and explain. \nA. Accelerate alginate setting., B. Retard alginate setting., C. No effect on setting., D. None of the above.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]