This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S., Subject name: Medicine
A chronic alcoholic presented to the casualty with altered sensorium. His blood sugar level was normal. Which of the following is the treatment to be given:- 
Select and explain. 
A. Inj.VitaminBl, B. IV dextrose 5%, C. IV dextrose 50%, D. IV Normal saline
A: Inj.VitaminBl
Answer: A: Inj.VitaminBl 
Explanation: Ans. is 'a' Inj. Vitamin B1 .This chronic alcoholic patient is in altered sensorium due to Wernicke's encephalopathy.TreatmentWernicke's disease is a medical emergency and requires immediate administration of thiamine (i.v. or i.m.).Note: That glucose infusion may precipitate Wernicke's disease in a previously unaffected patient or cause a rapid worsening of an early form of the disease.For this reason thiamine should be administered to all alcoholic patients requiring parenteral glucose.