**Core Concept**
Rokitansky-Kuster-Hauser (RKH) syndrome, also known as Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome, is a rare congenital disorder characterized by the underdevelopment or absence of the vagina and uterus in individuals with a normal 46,XX karyotype. This condition is often associated with other anatomical abnormalities, but it does not typically involve ovulatory dysfunction.

**Why the Correct Answer is Right**
Anovulation refers to the failure of ovulation, which is not a characteristic feature of RKH syndrome. Individuals with RKH syndrome have normal ovarian function and typically experience regular menstrual cycles due to the presence of functioning ovaries. However, they may experience amenorrhea due to the absence of the uterus. The correct answer is anovulation because it implies a failure to ovulate, which is not a feature of this syndrome.

**Why Each Wrong Option is Incorrect**
**Option A:** Absent uterus is a characteristic feature of RKH syndrome, as individuals with this condition often have a non-functional or absent uterus.

**Option B:** Absent vagina is also a characteristic feature of RKH syndrome, as many individuals with this condition have a short or absent vagina.

**Option D:** 46-XX is the typical karyotype of individuals with RKH syndrome, indicating that they have a normal number of X chromosomes.

**Clinical Pearl / High-Yield Fact**
Individuals with RKH syndrome often have a normal ovarian reserve and can undergo ovarian stimulation and egg retrieval for assisted reproductive technologies, such as in vitro fertilization (IVF), if they desire to conceive.

**✓ Correct Answer: C. Anovulation**