This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anaesthetic equipments, 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 constitutes a mixture of 95% Ca(OH)2, 5%NaOH, 1% KOH. Ba(OH)2 is a component of Beralime.