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
[{'content': "A patient is known alcoholic since last 20 yrs, suddenly he develops restless tremors, agitation. Diagnosis ? \nSelect and explain. \nA. Delirium tremens, B. Psychosis, C. Wernicke's encephalopathy, D. Kursakoff's syndrome", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Delirium tremens", 'role': 'assistant'}]