A 55-year-old male with type 2 diabetes presents for routine follow-up. His HbA1c is 8.9%. He is currently on metformin 1000 mg twice daily. What is the most appropriate next step?
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A
Add a GLP-1 receptor agonist or SGLT-2 inhibitor
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B
Switch to insulin immediately
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C
Increase metformin to 2500 mg/day
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D
Refer to endocrinology before any medication change