**Core Concept**
Methanol toxicity is a serious condition that can occur due to ingestion of methanol-containing substances. The **toxicity** of methanol is primarily due to its metabolites, **formaldehyde** and **formic acid**.

**Why the Correct Answer is Right**
The correct answer is related to the amount of methanol that can cause fatal **metabolic acidosis** and **optic neuropathy**. A dose of approximately 1 mL/kg of pure methanol can be toxic, but the fatal dose is generally considered to be around 1-2 mL/kg.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is too low.
**Option B:** This option might seem plausible but is not the most accurate choice.
**Option D:** This option is incorrect because it is too high.

**Clinical Pearl / High-Yield Fact**
Methanol toxicity can be treated with **fomepizole**, an **alcohol dehydrogenase inhibitor**, which prevents the formation of toxic metabolites.

**Correct Answer:** C. 1 mL/kg