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': 'K2SO4 in agar-agar is for: \nSelect and explain. \nA. Accelerating the setting stage of gypsum, B. Increase strength, C. Give dimensional stability, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]