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Review Question - QID 108019

QID 108019 (Type "108019" in App Search)
A middle aged man is brought in by emergency medical services after being found unconscious, lying on the street next to an empty bottle of vodka. His past medical history is unknown. Upon evaluation, he opens his eyes spontaneously and is able to obey commands. After peripheral access is obtained, IV normal saline and glucose are administered. Suddenly, the patient becomes confused and agitated. Horizontal nystagmus is noted on exam. This acute presentation was likely caused by a deficiency in which of the following?