A 58-year-old male with type 2 diabetes presents with a fasting glucose of 310 mg/dL and HbA1c of 10.2%. 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
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B
Add a sulfonylurea
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C
Initiate insulin therapy
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D
Increase metformin to 2550 mg/day