**Core Concept**
Chloroform is a potent inhalational anesthetic and a volatile organic solvent that can cause respiratory and cardiac depression, leading to fatal outcomes. Its toxicity is due to the formation of dichloroacetic acid and trichloroethanol in the liver, which disrupts oxidative phosphorylation and ATP production.

**Why the Correct Answer is Right**
Chloroform's mechanism of toxicity involves the inhibition of the enzyme cytochrome P450, which is essential for the metabolism of various drugs and endogenous substances. At higher concentrations, chloroform can cause direct damage to the mitochondrial membranes, leading to the release of cytochrome c and the activation of apoptosis. The fatal blood levels of chloroform are typically reported to be around 100-150 mg/L.

**Why Each Wrong Option is Incorrect**
**Option A:** The given value is too low, as it would not be sufficient to cause significant toxicity.
**Option B:** This option is incorrect, as it is below the reported fatal blood levels.
**Option C:** This option is incorrect, as it is higher than the reported fatal blood levels.

**Clinical Pearl / High-Yield Fact**
Chloroform is a highly lipophilic substance that can cause rapid absorption through the lungs, skin, and gastrointestinal tract, leading to rapid onset of toxicity.

**Correct Answer: B. 120 mg/L**