**Core Concept**
West syndrome, also known as infantile spasms, is a rare but severe form of epilepsy that affects infants and young children. It is characterized by a specific pattern of seizures, developmental regression, and distinct electroencephalogram (EEG) abnormalities. The pharmacological management of West syndrome involves the use of medications that can modify the underlying pathophysiology of the condition.

**Why the Correct Answer is Right**
The drug of choice for West syndrome is vigabatrin, an antiepileptic medication that inhibits the enzyme gamma-aminobutyric acid transaminase (GABA-T), thereby increasing the concentration of the inhibitory neurotransmitter GABA in the brain. This action is thought to be beneficial in reducing the frequency and severity of seizures in patients with West syndrome. Vigabatrin has been shown to be effective in controlling spasms and improving developmental outcomes in children with this condition.

**Why Each Wrong Option is Incorrect**
**Option A:** Phenobarbital is a first-line antiepileptic medication but is not the preferred choice for West syndrome due to its limited efficacy in controlling spasms and potential for side effects.
**Option B:** Topiramate is an antiepileptic medication that can be used for various seizure types but is not the first-line treatment for West syndrome.
**Option C:** Midazolam is a benzodiazepine that can be used for acute seizure control but is not the preferred long-term treatment for West syndrome.

**Clinical Pearl / High-Yield Fact**
Vigabatrin is a high-yield medication for West syndrome, and its use is associated with improved outcomes in children with this condition. However, its use is also associated with a risk of visual field defects, and patients should be closely monitored for this potential side effect.

**Correct Answer: C. Vigabatrin**