Which of the following pregnancy categories has no risk to fetuses?
Category X
Category A
Category B
Category C
Category A
Rationale: Pregnancy Category A has no risk to fetuses. Category B includes drugs that have had no adequate studies in pregnant women, and animal studies have shown no risks. Category C includes drugs for which animal studies have shown risks, but there are no adequate human studies. Category X includes drugs that are positively known to cause fetal harm.
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