This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Substance Related and Addictive Disorders, Subject name: Psychiatry
Thiamine dose in patients with delirium tremens is about: 
Select and explain. 
A. 100-200 mg per oral/Parenteral daily, B. 250 mg per oral/Parenteral daily for first 3-5 days, C. 400 mg per oral/Parenteral daily, D. 500 mg per oral/Parenteral daily
B: 250 mg per oral/Parenteral daily for first 3-5 days
Answer: B: 250 mg per oral/Parenteral daily for first 3-5 days 
Explanation: In patients who are undergoing inpatient detoxification, Parenteral thiamine 250 mg/ day should be given for 5 days followed by oral thiamine. As delirium tremens is complicated alcohol withdrawal that is always treated inpatient, the same dosage should be used. Thiamine is used to prevent development of Wernicke's encephalopathy.