system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 59-year-old man with alcohol use disorder is brought to the emergency department by a friend because of progressively worsening forgetfulness and frequent falls. He appears disheveled. On mental status examination, he is confused and oriented only to person. Neurologic examination shows horizontal nystagmus on lateral gaze. He walks with wide-based, small steps and his gait is unsteady. An MRI of the brain is shown. Supplementation of which of the following is most likely to have prevented this patient's current condition?
assistant
Vitamin B1