Which statement best defines a teratogen?

Which statement best defines a teratogen?

• A. A substance that can cause developmental abnormalities in fetuses
• B. A substance that can cause cancer
• C. A substance that can cause convulsions
• D. A substance that triggers an allergic reaction

Answer: (A)

Teratogens are substances that can cause developmental abnormalities in fetuses. They affect fetal development during pregnancy, especially when exposure happens during organ formation in the first trimester, and the outcome depends on the substance, dose, and timing. In a hazmat context, this means extra precautions are needed to protect pregnant workers from certain chemicals that could lead to birth defects, even if there are no immediate effects on the mother. The other effects described—causing cancer (carcinogens), provoking convulsions (neurotoxic effects), or triggering allergic reactions—are not what defines a teratogen.

Teratogens are substances that can cause developmental abnormalities in fetuses. They affect fetal development during pregnancy, especially when exposure happens during organ formation in the first trimester, and the outcome depends on the substance, dose, and timing. In a hazmat context, this means extra precautions are needed to protect pregnant workers from certain chemicals that could lead to birth defects, even if there are no immediate effects on the mother. The other effects described—causing cancer (carcinogens), provoking convulsions (neurotoxic effects), or triggering allergic reactions—are not what defines a teratogen.