**Question:** All of the following statements about Gynaecomastia are true except

A. Gynaecomastia is a common condition in males, characterized by enlarged breast tissue.
B. It is caused by hormonal imbalance, usually an excess of estrogen or a deficiency of androgens.
C. It is a rare condition in females.
D. It is a sign of serious underlying pathology like cancer, liver disease, or hypothyroidism.

**Correct Answer:** **C. Gynaecomastia is a rare condition in females.**

**Core Concept:** Gynaecomastia is a condition characterized by the enlargement of the male breast tissue due to hormonal imbalance. In males, it is usually caused by an excess of estrogen or a deficiency of androgens, which leads to an imbalance in the production of hormones responsible for breast development.

**Why the Correct Answer is Right:** Gynaecomastia is indeed a common condition in males, affecting around 50% of men at some point in their lives. However, the statement that gynaecomastia is rare in females is not accurate. While the condition is less common in females, it still occurs, usually due to hormonal imbalance or other factors like medications, breastfeeding, or liver disease.

**Why Each Wrong Option is Incorrect:**

**A. Hormonal imbalance:** As mentioned earlier, hormonal imbalance is a common cause of gynaecomastia in males. However, this explanation applies to both males and females, making it irrelevant to the correct answer choice.

**B. Estrogen excess:** In males, estrogen excess is a significant factor in gynaecomastia development due to the imbalance in estrogen and androgen production. In females, this explanation is more appropriate but does not fully address the cause of gynaecomastia in females.

**D. Serious underlying pathology:** While gynaecomastia is often a first sign of serious underlying pathology, this explanation is too broad and does not specifically address the rarity of the condition in females.

**Why C is Incorrect:** The statement "Gynaecomastia is a rare condition in females" is incorrect. Gynaecomastia can be caused by various factors in females, such as hormonal imbalance (estrogen excess), breastfeeding, medications, or liver disease. Therefore, this statement does not accurately describe the condition in females and is the correct answer.

**Clinical Pearls:**

Gynaecomastia is a common clinical condition in males, typically caused by hormonal imbalance, particularly estrogen excess or androgen deficiency. In females, the condition can be caused by a variety of factors, including hormonal imbalance, medications, breastfeeding, and liver disease. A proper understanding of these underlying causes is crucial for accurate diagnosis and treatment of the condition.