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': 'Use of reversible hydrocolloid needs \nSelect and explain. \nA. Two thermostatically controlled water baths, B. Three thermostatically controlled water baths, C. Four thermostatically controlled water baths, D. Five thermostatically controlled water baths', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]