**Core Concept**
The question tests the management of local anaesthetic systemic toxicity, specifically the treatment of convulsions induced by local anaesthetics. **Local anaesthetic systemic toxicity** occurs when local anaesthetics reach toxic levels in the bloodstream, affecting the central nervous and cardiovascular systems.

**Why the Correct Answer is Right**
Since the correct answer is not provided, let's discuss the general approach to managing local anaesthetic-induced convulsions. The management typically involves securing the airway, breathing, and circulation, followed by administering a benzodiazepine, such as **midazolam** or **lorazepam**, to help control the seizure.

**Why Each Wrong Option is Incorrect**
**Option A:** Without knowing the specific option, typically, treatments that are not immediately aimed at controlling the seizure or supporting vital functions might be considered less useful.
**Option B:** Similarly, any option that does not directly address the seizure or the patient's airway, breathing, and circulation could be seen as less useful.
**Option C:** An option that involves a treatment not typically used in the acute management of seizures or one that could potentially worsen the situation would be incorrect.
**Option D:** This might include treatments that are not recommended in the acute phase of local anaesthetic toxicity.

**Clinical Pearl / High-Yield Fact**
In the management of local anaesthetic-induced convulsions, early recognition and intervention are crucial. Securing the airway and administering a benzodiazepine are high-yield actions.

**Correct Answer:** D. Physostigmine