What is a teratogen?

• A. An agent that enhances fetal development
• B. An agent that causes malformation in embryos or fetuses
• C. An agent that triggers normal growth in fetuses
• D. An agent that has no impact on early development

Answer: (B)

A teratogen is defined as an agent that causes malformation or abnormal development in embryos or fetuses during pregnancy. These agents can lead to physical defects, functional abnormalities, or various developmental issues in the offspring. The impact of teratogens can vary depending on the timing of exposure, the dose, and the genetic susceptibility of the developing fetus.

The key characteristic of a teratogen is its potential to disrupt normal developmental processes, which distinguishes it from other agents that may enhance or have no effect on fetal growth. This understanding is crucial in the field of toxicology and prenatal care, as awareness of teratogenic agents can guide recommendations for pregnant individuals to minimize risks to fetal health.