Final answer:
Only rubella causes congenital heart defects and cataracts among TORCH infections. While toxoplasmosis and CMV can also affect a developing fetus, they do not specifically cause congenital heart defects and cataracts as rubella does.
Step-by-step explanation:
Of TORCH infections, only rubella causes congenital heart defects and cataracts. Toxoplasmosis, while it can cross the placenta and cause serious infections in the developing fetus, is known to lead to other serious symptoms such as damage to the central nervous system, but not specifically congenital heart defects and cataracts as rubella does. On the other hand, Cytomegalovirus (CMV) can cause various issues in newborns like jaundice, deafness, and blindness, but it's not associated with congenital heart defects directly as well. Therefore, the correct answer is b) Rubella.