Drug-induced teratogenesis is most likely to occur:
a. during the first trimester of pregnancy.
b. during the second trimester of pregnancy.
c. during the third trimester of pregnancy.
d. during labor and delivery.
ANS: A
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A Correct: This is true, because this is the time of active and rapid development of new fetal organs.
B Incorrect: Although these effects can occur then, this is a period of less formation and more maturation.
C Incorrect: Although these effects can occur then, this is a period of less formation and more maturation.
D Incorrect: There is the time teratogens are least likely to affect the fetus, although they certainly can affect the fetus at this time.
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