As regard the PCOS and hyperinsulinaemia:a) Hyperinsulinaemia is observed in about 40% to 5O% of women with PCOSb) Hyperinsulinaemia stimulates hepatic synthesis of SHBGc) Metformin causes hypoglycaemia in normo-glycaemic womend) Metformin has many other health benefits

**Core Concept**
Hyperinsulinaemia is a common feature in women with Polycystic Ovary Syndrome (PCOS), contributing to insulin resistance and metabolic dysregulation. This condition is characterized by elevated insulin levels, often due to insulin resistance, which can lead to various metabolic complications.

**Why the Correct Answer is Right**
Hyperinsulinaemia in PCOS is associated with insulin resistance, which is a key pathophysiological mechanism underlying the syndrome. Insulin resistance leads to increased insulin secretion, resulting in hyperinsulinaemia. This, in turn, contributes to the development of metabolic complications, including dyslipidaemia, hypertension, and an increased risk of type 2 diabetes. The correct answer, **a)**, highlights the prevalence of hyperinsulinaemia in women with PCOS.

**Why Each Wrong Option is Incorrect**
**Option B:** Hyperinsulinaemia actually suppresses the hepatic synthesis of Sex Hormone Binding Globulin (SHBG), leading to decreased SHBG levels. This is because insulin inhibits the production of SHBG in the liver.

**Option C:** Metformin does not cause hypoglycaemia in normoglycaemic women. Instead, it works by decreasing hepatic glucose production and increasing insulin sensitivity, which helps to lower blood glucose levels in both normoglycaemic and hyperglycaemic individuals.

**Option D:** Metformin does have many health benefits, including reducing the risk of cardiovascular disease and improving metabolic parameters in patients with PCOS. However, this option is not directly related to the relationship between PCOS and hyperinsulinaemia.

**Clinical Pearl / High-Yield Fact**
Women with PCOS often exhibit insulin resistance, which contributes to the development of metabolic complications. Recognizing the link between PCOS and hyperinsulinaemia is crucial for effective management and prevention of long-term metabolic consequences.

**Correct Answer: A. Hyperinsulinaemia is observed in about 40% to 50% of women with PCOS**