**Core Concept**
Tonic-clonic seizures, also known as grand mal seizures, are a type of generalized seizure characterized by a tonic phase of muscle stiffening followed by a clonic phase of rapid muscle contractions. The drug of choice for managing tonic-clonic seizures is typically a first-line antiepileptic medication that can effectively control seizure frequency and severity.

**Why the Correct Answer is Right**
The correct answer is a first-line antiepileptic medication that works by modulating the activity of various neurotransmitters and ion channels in the brain. Specifically, it inhibits the release of excitatory neurotransmitters such as glutamate and aspartate, and enhances the release of inhibitory neurotransmitters such as GABA. This results in a decrease in the excitability of neurons and a reduction in the likelihood of seizure occurrence. The medication is well-tolerated and has a relatively favorable side effect profile.

**Why Each Wrong Option is Incorrect**
* **Option A:** This medication is primarily used for the treatment of bipolar disorder and has a lower efficacy for tonic-clonic seizures.
* **Option B:** This medication is more commonly used for the treatment of absence seizures and may not be as effective for tonic-clonic seizures.
* **Option C:** This medication is primarily used for the treatment of neuropathic pain and may not be suitable for the management of tonic-clonic seizures.

**Clinical Pearl / High-Yield Fact**
When choosing an antiepileptic medication, it's essential to consider the patient's seizure type, frequency, and severity, as well as potential interactions with other medications and comorbidities.

**Correct Answer: C. Carbamazepine**