After teaching a class about the various drugs used to control blood glucose, the instructor determines that the teaching was successful when the class identifies what as a biguanide?

Metformin

Explanation:

Metformin is classified as a biguanide. Miglitol is an alpha-glucosidase inhibitor. Tolbutamide is a first generation sulfonylurea. Glipizide is a second generation sulfonylurea.

answer; i believe the correct answer is ( proteins );