**Question:** All are parts of vulva except-

A. Labia Majora
B. Labia Minora
C. Vagina
D. Urethra

**Core Concept:**
The vulva is a group of external female genital organs that form the anterior part of the perineum and are involved in sexual arousal, lubrication, and childbirth. The primary structures of the vulva include the labia majora, labia minora, and vagina. The urethra is a separate structure, part of the urinary system, and not a component of the vulva.

**Why the Correct Answer is Right:**
D. Urethra is the correct answer because it is part of the urinary system, specifically the urethral canal, which extends from the urinary bladder to the external opening. The urethra does not have a role in sexual arousal, lubrication, or childbirth, making it an incorrect component of the vulva.

**Why Each Wrong Option is Incorrect:**
A. Labia Majora (Latin for "large lips") are the two fleshy folds of skin that surround the labia minora. They are primarily composed of loose areolar tissue and provide support to the labia minora. The labia majora are part of the vulva and are involved in sexual arousal and lubrication.
B. Labia Minora (Latin for "small lips") are the two inner folds of skin that surround the clitoris and urethral orifice. They are composed of elastic connective tissue and are involved in sexual arousal and lubrication.
C. Vagina is the muscular, elastic, and secretory canal that extends from the cervix to the vulva and serves as the birth canal during childbirth. The vagina is a crucial part of the female reproductive system and not a component of the vulva.

**Clinical Pearl or High-Yield Fact:**
The vulva is a crucial part of female sexual health, providing support, protection, and facilitating sexual arousal, lubrication, and childbirth. Understanding the anatomy of the vulva is essential for proper diagnosis, management, and treatment of various vulvar disorders, such as infections, injuries, and cancers. Understanding the distinction between the key components of the vulva (labia majora, labia minora, and vagina) is crucial for accurate clinical diagnosis and management of vulvar conditions.