Final answer:
Metformin is used in the treatment of diabetes to reduce liver-produced glucose and increase the body's sensitivity to insulin.
Step-by-step explanation:
Metformin is used in the treatment of diabetes. It is an oral medication that helps control blood sugar levels. It works by reducing the amount of glucose produced by the liver and increasing the body's sensitivity to insulin. Metformin does not stimulate insulin secretion, but it helps insulin work more effectively in the body. Therefore, the correct answer is E. Only A and B.