## **Core Concept**
Chromosomal anomalies are associated with various conditions, and the percentage of chromosomal anomalies can vary depending on the specific condition or population being studied. In the context of recurrent pregnancy loss, chromosomal anomalies in one partner can significantly impact the likelihood of successful pregnancy outcomes.

## **Why the Correct Answer is Right**
The correct answer, **C. Recurrent pregnancy loss**, is associated with a higher percentage of chromosomal anomalies, specifically more than 20% in some studies. Recurrent pregnancy loss, defined as the loss of three or more consecutive pregnancies, has been linked to various factors, including parental chromosomal abnormalities. These abnormalities can include balanced translocations, which may not affect the carrier but can lead to unbalanced chromosomes in offspring, increasing the risk of miscarriage.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While chromosomal anomalies can occur in any pregnancy, there isn't a direct, well-established link to a specific percentage like "more than 20%" without context. This option lacks specificity regarding the condition or context.
- **Option B:** Similar to Option A, this choice is vague and does not directly relate to a well-known condition associated with chromosomal anomalies exceeding 20%.
- **Option D:** This option does not provide enough information to assess its relevance to chromosomal anomalies being more than 20%.

## **Clinical Pearl / High-Yield Fact**
A significant clinical pearl is that **recurrent pregnancy loss** is associated with an increased risk of parental chromosomal abnormalities, particularly balanced translocations. Screening for these abnormalities in couples experiencing recurrent miscarriages can provide valuable information for genetic counseling and future pregnancy management.

## **Correct Answer:** C. Recurrent pregnancy loss