Q: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Question: A 52-year-old male presents with acute form a confusional syndrome, paresis of both external ocular rectus muscles and gait ataxia. 
 Options:  <1> Hyperglycemic encephalopathy. <2> Korsakoff encephalopathy. <3> Cerebellar infarction. <4> Administer thiamin immediately. <5> Lead poisoning.
A:
4