This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
An alcoholic addicted presents in an emergency with irrelevant talking & disoriented to time, place and person. There is h/o not taking alcohol from last 3 days & no head injury. He also has a visual hallucination. The diagnosis - 
Select and explain. 
A. Dementia praecox, B. Delirium tremens, C. Schizophrenia, D. Korsakoff psychosis
B: Delirium tremens
Answer: B: Delirium tremens 
Explanation: Disorientation and visual hallucinations after 3 days of alcohol abstinence, in an alcoholic, suggest the diagnosis of delirium tremens.