**Core Concept**
Mullerian duct anomalies are congenital malformations of the female reproductive tract resulting from the abnormal development of the paramesonephric ducts (Mullerian ducts). These anomalies can lead to various uterine, cervical, and vaginal abnormalities.

**Why the Correct Answer is Right**
The correct answer is **B. Uterus didelphys**. Uterus didelphys is a type of Mullerian duct anomaly where two separate uterine horns are present, each with its own cervix and sometimes a separate vagina. This condition arises due to the failure of the Mullerian ducts to fuse during embryonic development. The presence of two cervixes is a characteristic feature of uterus didelphys, making it essential to identify this anomaly in clinical practice.

**Why Each Wrong Option is Incorrect**
* **Option A:** Bicornuate uterus is a Mullerian duct anomaly where the uterus is shaped like a heart, but it typically has a single cervix and a single vagina.
* **Option C:** Septate uterus is another type of Mullerian duct anomaly where a septum divides the uterus, but it also has a single cervix and a single vagina.

**Clinical Pearl / High-Yield Fact**
Uterus didelphys can be associated with complications such as recurrent miscarriage, preterm labor, and fetal growth restriction due to the abnormal uterine environment.

**Correct Answer: B. Uterus didelphys**