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': 'All are constituents of soda lime except \nSelect and explain. \nA. Ca(OH)2, B. Ba(OH)2, C. Silica, D. Moisture', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Ba(OH)2', 'role': 'assistant'}]