**Core Concept**
The patient's symptoms suggest a diagnosis of alcohol withdrawal syndrome, a condition that occurs when an individual who has been heavily using alcohol for a prolonged period suddenly stops or reduces their consumption. This results in an imbalance of neurotransmitters such as GABA and glutamate, leading to symptoms like agitation, confusion, and hallucinations.

**Why the Correct Answer is Right**
Benzodiazepines are the preferred treatment for alcohol withdrawal syndrome due to their ability to enhance the activity of GABA, a neurotransmitter that helps calm down neural activity. They work by binding to GABA_A receptors, which increases the flow of chloride ions into the neuron, leading to hyperpolarization and reduced neuronal excitability. This helps to alleviate symptoms of alcohol withdrawal by reducing the hyperactivity of the brain.

**Why Each Wrong Option is Incorrect**
**Option A:** Haloperidol, a typical antipsychotic, may be used to manage agitation and hallucinations but is not the first-line treatment for alcohol withdrawal syndrome. It can even worsen the condition by blocking dopamine receptors, leading to increased risk of extrapyramidal side effects.

**Option B:** Olanzapine, an atypical antipsychotic, may be used off-label to manage symptoms of alcohol withdrawal but is not the preferred treatment. It can cause sedation, but its efficacy in managing withdrawal symptoms is not well established.

**Option C:** Methadone, an opioid agonist, is used in the management of opioid dependence, not alcohol withdrawal syndrome.

**Clinical Pearl / High-Yield Fact**
Benzodiazepines are the first-line treatment for alcohol withdrawal syndrome because they work by enhancing the activity of GABA, a neurotransmitter that helps calm down neural activity.

**Correct Answer:** C. Lorazepam (or another benzodiazepine) can be used in the immediate treatment of alcohol withdrawal syndrome.