Which of the following is the most common manifestation of polycystic ovarian syndrome?

Hirsutism is recognized as the most common manifestation of polycystic ovary syndrome (PCOS) due to the hormonal imbalances characteristic of this condition. PCOS often leads to elevated levels of androgens, which are male hormones present in lower levels in females. This excess of androgens can cause excessive hair growth in areas where males typically grow hair, such as the face, chest, and back. This symptom can significantly impact a woman’s quality of life, both physically and emotionally, making it a very prominent feature of PCOS.

In contrast, the other options do not directly align with the typical presentations of PCOS. Desquamation refers to the shedding of the outer layers of skin, which is not a primary concern in PCOS. Galactorrhea, which is the inappropriate lactation not associated with childbirth, is more commonly related to other conditions, such as hyperprolactinemia. Rebound tenderness indicates potential peritoneal irritation or appendicitis and is not relevant to the hormonal and reproductive aspects of PCOS. Thus, hirsutism stands out as the hallmark symptom of PCOS, highlighting the condition's influence on hair growth due to its androgen excess.