For which patient would a biguanide antidiabetic drug be contraindicated?

Question

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Biguanides, such as metformin, are contraindicated in patients with known kidney disease due to the risk of lactic acidosis. They should also be used with caution in patients with liver disease or heart failure. A is incorrect because biguanides are often used in pregnant women with gestational diabetes. B and D are incorrect because biguanides are commonly used in newly diagnosed type 2 diabetics and in diabetic patients with functioning pancreatic beta cells.

For Which Patient Would a Biguanide Antidiabetic Drug Be Contraindicated