**Core Concept**
Lignocaine toxicity is a medical emergency that requires prompt treatment. The drug of choice in lignocaine toxicity is a benzodiazepine, specifically flumazenil is not used here, rather it is a lipid emulsion.

**Why the Correct Answer is Right**
Lignocaine toxicity is primarily treated with lipid emulsion therapy, which is believed to work by sequestering the toxin in lipids and reducing its concentration in the bloodstream. Lipid emulsions have been shown to be effective in treating local anesthetic systemic toxicity (LAST) in animal studies and case reports. The use of lipid emulsions is supported by the American Society of Regional Anesthesia and Pain Medicine (ASRA) and the American Heart Association (AHA) guidelines.

**Why Each Wrong Option is Incorrect**
**Option A:** Flumazenil is a benzodiazepine receptor antagonist used to reverse benzodiazepine overdose, not lignocaine toxicity.
**Option B:** Sodium bicarbonate is used to treat tricyclic antidepressant overdose, not lignocaine toxicity.
**Option C:** Activated charcoal is not effective in treating lignocaine toxicity as it is not a drug that is absorbed from the gastrointestinal tract.

**Clinical Pearl / High-Yield Fact**
In the case of lignocaine toxicity, early recognition and prompt treatment with lipid emulsion therapy can significantly improve outcomes. It is essential for anesthesiologists and emergency physicians to be familiar with the management of LAST.

**Correct Answer: C. Lipid emulsion.