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
All are constituents of soda lime except – 
Select and explain. 
A. Ca(OH)2, B. Ba(OH)2, C. Silica, D. Moisture
B: Ba(OH)2
Answer: B: Ba(OH)2 
Explanation: Sodalime contains Ca(OH)2 (94%), NaOH (5%), KOH (< 1%), Silica, indicator and moisture.