Final answer:
Congenital rubella syndrome can result in a congenital heart condition, commonly a ventricular septal defect, due to the teratogenic effect of the rubella virus when a mother is infected during the first trimester.
Step-by-step explanation:
The congenital heart condition associated with congenital rubella is most notably the development of structural defects in the heart, such as septal defects. When a woman contracts rubella during pregnancy, particularly in the first trimester, the virus may cross the placenta and cause congenital rubella syndrome (CRS), leading to a high risk of miscarriage, stillbirth, or congenital defects, including those affecting the heart. A common structural defect from CRS is a ventricular septal defect (VSD), where there is an opening in the interventricular septum of the heart.