Which of the following is not metabolized by liver ?
**Core Concept**
The question is testing the student's knowledge of drug metabolism, specifically which drugs are not metabolized by the liver. Liver metabolism involves various pathways, including oxidation, reduction, hydrolysis, and conjugation, which are carried out by enzymes such as cytochrome P450.
**Why the Correct Answer is Right**
The correct answer is likely to be a drug that is primarily excreted by the kidney or undergoes metabolism in another organ. For example, drugs like penicillin are primarily excreted by the kidney and do not undergo significant liver metabolism.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is likely to be a drug that undergoes extensive liver metabolism, such as warfarin or phenytoin. These drugs are metabolized by the liver through various pathways, including oxidation and conjugation.
**Option B:** This option is likely to be a drug that is metabolized by the liver, such as diazepam or midazolam. These benzodiazepines are metabolized by the liver through oxidation and conjugation.
**Option C:** This option is likely to be a drug that is metabolized by the liver, such as acetaminophen or aspirin. These drugs are metabolized by the liver through various pathways, including oxidation and conjugation.
**Clinical Pearl / High-Yield Fact**
It's worth noting that some drugs may undergo enterohepatic recirculation, where they are excreted into the bile and then reabsorbed from the intestine, only to be excreted again into the bile. This can affect the pharmacokinetics of these drugs and lead to prolonged exposure.
**Correct Answer:** D