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: Pharmacology
Which of the following is not metabolized by liver ? 
Select and explain. 
A. Flunitrazepan, B. Diazepam, C. Oxazepam, D. Nitrazepam
C: Oxazepam
Answer: C: Oxazepam 
Explanation: Ans. is 'c' i.e., Oxazepam o Active metabolites are not formed by Oxazepam, Lorazepam, Temazepam --> So these drugs are sho acting and can be used in liver failure as these drugs are directly conjugated without metabolism.