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
Percentage of Halothane metabolized ? 
Select and explain. 
A. 1%, B. 5%, C. 10%, D. 20%
D: 20%
Answer: D: 20% 
Explanation: Ans. is 'd' i.e., 20% Most of the inhaled anaesthetics are eliminated from lungu though some metabolism in liver may occur. In terms of extent of hepatic metabolism, the rank of order is methoxyflurane (> 50%) > Halothane (20%) > Ether (10-157o) > enflurane (3-5%) desflurane (< 0.1%) > NrO (0%). NrO does not have any metabolism in the body.