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
A patient is known alcoholic since last 20 yrs, suddenly he develops restless tremors, agitation. Diagnosis ? 
Select and explain. 
A. Delirium tremens, B. Psychosis, C. Wernicke's encephalopathy, D. Kursakoff's syndrome
A: Delirium tremens
Answer: A: Delirium tremens 
Explanation: Ans. is 'a' i.e., Delirium tremens