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': 'Which one of the following increases the strength and reduce viscosity of agar hydrocolloid impression material: \nSelect and explain. \nA. Borax, B. Water, C. Sulfates, D. Carbonates', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]