A 68-year-old patient with type 2 diabetes has an HbA1c of 9.2%. Which medication adjustment is most appropriate if they are already on metformin 1000mg twice daily?
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A
Add a GLP-1 receptor agonist
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B
Switch to insulin glargine only
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C
Add a sulfonylurea
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D
Increase metformin to 2500mg daily