Which of the Following Statements Is True About the Impact

Multiple Choice

Which of the following statements is true about the impact of teratogens?

A) Very few fetuses are exposed to teratogens,so it is easy to determine which teratogen causes which defect.
B) Fetuses are safe from the effects of teratogens during the first trimester.
C) Teratogens cause anatomical defects only after organogenesis is complete.
D) Exposure to teratogens does more damage when it occurs at some points in development than at others.