A nurse is instructing a pregnant patient concerning the potential risk to her fetus from a pregnancy category B drug.What would the nurse inform the patient?

There is evidence of human fetal risk, but the potential benefits from the use of the drug may be acceptable despite potential risks.

Animal studies have shown an adverse effect on the fetus, but there are no adequate studies in pregnant women.

Adequate studies in pregnant women have demonstrated that there is no risk to the fetus.

Animal studies have not demonstrated a risk to the fetus, but there have been no adequate studies in pregnant women.