## Core Concept
A unicornuate uterus is a type of Müllerian duct anomaly where one side of the uterus does not develop properly, resulting in a single, often smaller and sometimes functional, uterine cavity. This condition is a form of congenital uterine anomaly.

## Why the Correct Answer is Right
The correct answer, , implies that a unicornuate uterus is associated with a higher risk of pregnancy complications and often presents with a rudimentary horn which may or may not communicate with the main uterine cavity. This condition arises due to the abnormal development of one Müllerian duct. The unicornuate uterus may have a non-communicating or communicating rudimentary horn on the opposite side.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is incorrect because it does not accurately describe a characteristic feature of a unicornuate uterus.
- **Option B:** This option is incorrect as it does not specify the accurate clinical implication or characteristic of a unicornuate uterus.
- **Option C:** This option is incorrect because it does not provide a true statement regarding the unicornuate uterus.

## Clinical Pearl / High-Yield Fact
A key point to remember is that individuals with a unicornuate uterus are at an increased risk of ectopic pregnancy, especially if there is a communicating rudimentary horn, and may have difficulties during pregnancy such as preterm labor or abnormal fetal presentation.

## Correct Answer: D.