**Core Concept:** Alcohol withdrawal syndrome (AWS) is a set of symptoms that occur when a person with long-standing alcohol use disorder (AUD) abruptly stops or significantly reduces alcohol intake. AWS can be life-threatening and requires careful management.

**Why the Correct Answer is Right:**
Alcohol is a central nervous system (CNS) depressant that reduces neuronal excitability. In chronic alcohol consumption, the brain adapts by downregulating the GABA receptor system, which is the primary target of alcohol's effect. When alcohol is abruptly stopped or significantly reduced, the brain becomes hyper-excitable, leading to AWS.

**Why Each Wrong Option is Incorrect:**
A. **Option A:** Hyperventilation is a feature of respiratory depression in AWS, not withdrawal.
B. **Option B:** Delirium tremens (DTs) is a severe form of AWS, not an essential feature of alcohol withdrawal.
C. **Option C:** Seizures are a severe form of AWS, not the primary feature.
D. **Option D:** Hallucinations are a severe form of AWS, not a general feature.

**Clinical Pearl / High-Yield Fact:**
In severe cases of AWS, the risk of mortality is up to 15% due to complications like DTs, seizures, and cardiovascular instability. It is crucial to manage AWS with proper medications and supportive care.

**Correct Answer:** .