An alcoholic is brought to the casualty,3 days after he quit alcohol,with the complaint of irrelevant talking.On examination,he is found to be dis-oriented to time,place and person.He also has visual illusions and hallucinations.There is no history of head injury.The most probable diagnosis is:

• A. Delirium tremens
• B. Dementia praecox
• C. Korsakoff psychosis
• D. Schizophrenia