Regarding PCOS and hyperinsulinaemia: (A) Hyperinsulinaemia is observed in about 40% to 80% of women with PCOS, (B) Metformin has many other health benefits, (C) Metformin causes hypoglycaemia in normoglycaemic women, (D) Hyperinsulinaemia stimulates hepatic synthesis of SHBG
Answer is B. In PCOS

Hyperinsulinemia is seen in 50-70% cases of PCOS
Insulin induces LH to cause thecal hyperplasia and secrete androgens
Hyperandrogenism lowers the level of hepatic sex hormone binding globulin
Metformin treats the root causes, rectifies endocrine and metabolic function, improves fertility rate, used as insulin sensitiser
It reduces insulin level, delays glucose absorption, liver production of glucose and improves peripheral resistance
Metformin do not cause hypoglycemia in a normoglycemic women