## **Core Concept**
Genital tuberculosis (GTB) is a form of extrapulmonary tuberculosis that affects the genital organs. It usually results from the hematogenous spread of Mycobacterium tuberculosis from a primary focus, often in the lungs. The most common sites affected are those with a rich blood supply.

## **Why the Correct Answer is Right**
The fallopian tubes are the most common site of genital tuberculosis, being involved in approximately 90-100% of cases. This high frequency is due to several factors: the tubes have a rich blood supply, and their endosalpinx is lined by ciliated columnar epithelium which is more susceptible to infection. The infection leads to caseous necrosis, scarring, and often results in a "tobacco pouch" or calcified appearance on imaging.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While the endometrium can be involved, making option A (uterus) a potential site for genital TB, it is less frequently involved compared to the fallopian tubes.
- **Option B:** The ovaries can also be involved, but they are less commonly the primary site compared to the fallopian tubes.
- **Option C:** This seems to be an incorrectly provided option but assuming it refers to another site, the key point is that fallopian tubes are the most common site.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that genital TB often presents with symptoms like pelvic pain, menstrual irregularities (such as oligomenorrhea or amenorrhea), and infertility. A high index of suspicion is necessary for diagnosis, especially in patients from endemic areas or with a history of TB.

## **Correct Answer:** D. Fallopian tubes.