## **Core Concept**
Rokitansky-Kuster-Hauser (RKH) syndrome, also known as Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome, is a rare congenital disorder characterized by the absence or underdevelopment of the vagina and uterus. This condition is a type of Müllerian agenesis, resulting from the abnormal development of the Müllerian ducts during embryogenesis.

## **Why the Correct Answer is Right**
The characteristic features of RKH syndrome include:
- The absence or underdevelopment of the vagina and uterus.
- Normal development of secondary sexual characteristics due to normal ovarian function.
- Presence of normal karyotype (46,XX).
- Often associated with renal and skeletal anomalies.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Typically, individuals with RKH syndrome have normal ovaries and normal secondary sexual characteristics, making this a characteristic feature.
- **Option B:** Renal anomalies are commonly associated with RKH syndrome, which can include agenesis, ectopia, or other malformations of the kidneys.
- **Option C:** The condition is characterized by the absence or underdevelopment of the vagina and uterus, which aligns with the description of RKH syndrome.
- **Option D:** This option is not listed, but based on the question, we need to identify which statement is not a characteristic feature.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that patients with MRKH syndrome have a 46,XX karyotype and normal ovarian function, which means they undergo normal pubertal development but may present with primary amenorrhea. The presence of normal ovaries also implies that these patients do not require hormone replacement therapy for pubertal development but may require surgical intervention for vaginal agenesis.

## **Correct Answer:** D.