**Core Concept**
Methyl alcohol (methanol) poisoning is a toxic condition caused by the ingestion of methanol, a potent depressant of the central nervous system. The treatment involves the administration of antidotes to prevent the formation of toxic metabolites.

**Why the Correct Answer is Right**
Methanol is metabolized by alcohol dehydrogenase to form formaldehyde, which is then converted to formic acid by aldehyde dehydrogenase. Formic acid is the primary toxic metabolite responsible for the clinical manifestations of methanol poisoning. Fomepizole is a competitive inhibitor of alcohol dehydrogenase, which prevents the formation of formic acid and is the preferred treatment for methanol poisoning. It is administered in conjunction with hemodialysis to remove methanol and its metabolites from the body.

**Why Each Wrong Option is Incorrect**
* **Option A:** Hemodialysis alone is not sufficient to treat methanol poisoning, as it does not prevent the formation of toxic metabolites.
* **Option B:** Ethanol is not the preferred treatment for methanol poisoning, as it can also be metabolized to form acetaldehyde, which can worsen the clinical condition.
* **Option D:** Activated charcoal is not effective in treating methanol poisoning, as it does not prevent the absorption of methanol or its metabolites.

**Clinical Pearl / High-Yield Fact**
The treatment of methanol poisoning requires prompt administration of fomepizole and hemodialysis to prevent the formation of toxic metabolites and remove methanol from the body.

**Correct Answer: C. Fomepizole and hemodialysis.**