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: Biochemistry
Hardening of sodalime done by? 
Select and explain. 
A. CaCO, B. CaSO4, C. BaSO4, D. Sodium silicate
D: Sodium silicate
Answer: D: Sodium silicate 
Explanation: Ans. is 'd' i.e.,Sodium silicateSoda lime is a mixture of chemicals, used in granular form in closed breathing environments, such as general anaesthesia to remove carbon dioxide from breathing gases to avoid hypercarbia