This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
Regarding PCOS and hyperinsulinaemia 
Select and explain. 
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
B: Metformin has many other health benefits
Answer: B: Metformin has many other health benefits 
Explanation: 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