## **Core Concept**
Fomepizole is an antidote used in the treatment of poisoning by certain toxic alcohols. It works by inhibiting alcohol dehydrogenase, an enzyme involved in the metabolism of these toxic substances. This action prevents the formation of more toxic metabolites.

## **Why the Correct Answer is Right**
Fomepizole is specifically indicated as an antidote for poisoning with methanol (C) and ethylene glycol (D), which are metabolized by alcohol dehydrogenase into formic acid and oxalic acid, respectively. These metabolites are highly toxic and can cause serious complications, including renal failure and visual disturbances. By inhibiting alcohol dehydrogenase, fomepizole effectively reduces the production of these toxic metabolites, thereby mitigating the severity of the poisoning.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is blank and does not provide a substance for comparison.
- **Option B:** This option is also blank and does not offer a relevant substance.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that fomepizole is used for poisoning with **methanol** and **ethylene glycol**. It is essential to remember that fomepizole works by inhibiting alcohol dehydrogenase, which is a critical step in the metabolism of these toxic alcohols. This makes fomepizole a valuable antidote in cases of poisoning with these substances.

## **Correct Answer:** . methanol and ethylene glycol.