You will be given a definition of a task first, then some input of the task.
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.
Output:
4