An alcoholic is brought to the Emergency OPD with the complaint or irrelevant talking. He had stopped using alcohol three days back. On examination, he is found to be disoriented to time, place and person. He also has visual illusions and hallucinations. There is no history of head injury. Most likely diagnosis is:

**Core Concept**
The patient is experiencing symptoms of a substance withdrawal syndrome, specifically delirium tremens (DTs), a life-threatening condition characterized by altered mental status, hallucinations, and autonomic instability. DTs occur typically 48-72 hours after the last drink in individuals with a history of chronic alcohol use.

**Why the Correct Answer is Right**
Delirium tremens is a manifestation of severe alcohol withdrawal, resulting from the abrupt cessation of ethanol, a central nervous system depressant. Ethanol exerts its effects by enhancing the activity of gamma-aminobutyric acid (GABA), an inhibitory neurotransmitter. Withdrawal of ethanol leads to a decrease in GABA activity, causing an imbalance in neuronal excitability, which manifests as seizures, tremors, and hallucinations. The patient's symptoms, including disorientation, visual illusions, and hallucinations, are consistent with DTs. The absence of a head injury makes this diagnosis more likely.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided. Please ensure that all options are present for a thorough explanation.
**Option B:** This option is also not provided.
**Option C:** This option is also not provided.
**Option D:** This option is also not provided.

**Clinical Pearl / High-Yield Fact**
Delirium tremens can be life-threatening if not recognized and managed promptly. The patient's symptoms may mimic those of other conditions, such as seizures, infections, or metabolic disturbances. Early recognition and treatment with benzodiazepines, such as lorazepam, are essential to prevent complications and improve outcomes.

**Correct Answer:** D. Delirium tremens.

✓ Correct Answer: B. Delirium tremens