The correct answer is F. This patient has taken phencyclidine, or PCP. Patients with PCP intoxication show signs of belligerence, impulsiveness, fever, psychomotor agitation, vertical and horizontal nystagmus, tachycardia, ataxia, homicidality, psychosis, and delirium. On withdrawal, patients may demonstrate a recurrence of intoxication when the PCP, which was trapped in an ionized form in the acidic gastric lumen, is reabsorbed in the alkaline duodenum. PCP users will have normal or small pupils. Death can result from a variety of causes, including respiratory depression and violent behavior.Answer A is incorrect. Patients presenting with acute alcohol intoxication will show symptoms of disinhibition, emotional lability, slurred speech, ataxia, coma, and blackouts. On withdrawal, they will demonstrate a tremor, tachycardia, hypertension, malaise, nausea, seizures, delirium tremens, tremulousness, agitation, and hallucinations.Answer B is incorrect. Patients presenting with amphetamine intoxication will display psychomotor agitation, impaired judgment, pupillary dilation, hypertension, tachycardia, euphoria, prolonged wakefulness and attention, cardiac arrhythmias, delusions, hallucinations, and fever. On withdrawal, they will show a post-use “crash” that includes depression, lethargy, headache, stomach cramps, hunger, and hyper-somnolence.Answer C is incorrect. Patients presenting with acute cocaine intoxication will show symptoms of euphoria, psychomotor agitation, impaired judgment, tachycardia, pupillary dilation, hypertension, hallucinations, paranoid ideations, angina, and sudden cardiac death. On withdrawal, they will show a post-use “crash” that includes severe depression, hyper-somnolence, fatigue, malaise, and severe psychological craving.Answer D is incorrect. Patients presenting with acute lysergic acid diethylamide intoxication will display marked anxiety or depression, delusions, visual hallucinations, flashbacks, and pupillary dilation.Answer E is incorrect. Patients presenting with acute nicotine intoxication will show symptoms of restlessness, insomnia, anxiety, and arrhythmias. On withdrawal, they will have symptoms of irritability, headache, anxiety, weight gain, craving, and tachycardia.