**Core Concept**
Trigeminal neuralgia is a chronic pain condition that affects the trigeminal nerve, causing intense, shock-like or electric shock-like pain in parts of the face. The first-line treatment aims to alleviate this pain and improve quality of life.

**Why the Correct Answer is Right**
The first-line treatment for trigeminal neuralgia is carbamazepine, a tricyclic antidepressant-like medication that acts as an anticonvulsant. It works by stabilizing abnormal electrical activity in the brain, which is thought to contribute to the development of trigeminal neuralgia. Carbamazepine specifically blocks the sodium channels in the nerve fibers, reducing the frequency and severity of pain attacks.

**Why Each Wrong Option is Incorrect**
**Option A:** Other options, such as baclofen or gabapentin, may be considered in cases of treatment failure or as adjunctive therapy, but they are not the first-line treatment.
**Option B:** Steroids, such as prednisolone, may be used to reduce inflammation and swelling in the nerve, but they are not a primary treatment for trigeminal neuralgia.
**Option C:** Surgery, including microvascular decompression, may be considered for patients who do not respond to medication, but it is not the first line of treatment.

**Clinical Pearl / High-Yield Fact**
Carbamazepine is a first-line treatment for trigeminal neuralgia due to its efficacy in reducing pain frequency and severity. However, it can have side effects, such as dizziness and nausea, which should be monitored and managed.

**Correct Answer:** C. Carbamazepine.