A 40-year-old man with alcohol use disorder presents with confusion, ophthalmoplegia, and ataxia after 5 days of poor oral intake. What is the immediate treatment?
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A
Oral thiamine 100 mg daily
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B
IV dextrose followed by thiamine
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C
IV thiamine 500 mg followed by dextrose
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D
High-dose IV multivitamins without thiamine