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: Anaesthesia
[{'content': 'Water is used for hardening in - \nSelect and explain. \nA. Sodalime, B. Baralime, C. Both, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Water of crystallization is used in Baralime and silica is used in sodalime', 'role': 'assistant'}]